Sorry I'm hoping this won't bore people but was thinking to do a year by year basic breakdown of the class of 1992

Just because I think at different times all 3 have been better than each other.

End of 1992/93 Season:

Ronnie: 0 Ranking Titles, 1 Invitational Title, Total: 1
Ranking: N/A

Higgins: 0 Ranking Titles, 0 Invitational Titles, Total: 0
Ranking: N/A

Williams: 0 Ranking Titles, 0 Invitational Titles, Total: 0
Ranking: N/A

End of 1993/94 Season:

Ronnie: 2 Ranking Titles, 2 Non-Ranking, Total: 4
Triple Crown Wins: 1 (1993 UK)
Ranking: 57

Higgins: 0 Ranking Titles, 0 Non-Ranking, Total: 0
Triple Crown Wins: 0
Ranking: 122

Williams: 0 Ranking Titles, 0 Non-Ranking, Total: 0
Triple Crown Wins: 0
Ranking: 119

End of 1994/95 Season:

Ronnie: 2 Ranking Titles, 3 Non-Ranking, Total: 5
Triple Crown Wins: 2 (1993 UK, 1995 Masters)
Ranking: 9

Higgins: 3 Ranking Titles, 0 Non-Ranking, Total: 3
Triple Crown Wins: 0
Ranking: 51

Williams: 0 Ranking Titles, 1 Non-Ranking, Total: 1
Triple Crown Wins: 0
Ranking: 58

Sorry I made a mistake with the rankings, let me update

End of 1992/93 Season:

Ronnie: 0 Ranking Titles, 1 Non-Ranking, Total: 1
Ranking: 57

Higgins: 0 Ranking Titles, 0 Non-Ranking, Total: 0
Ranking: 122

Williams: 0 Ranking Titles, 0 Non-Ranking, Total: 0
Ranking: 119

End of 1993/94 Season:

Ronnie: 2 Ranking Titles, 2 Non-Ranking, Total: 4
Triple Crown Wins: 1 (1993 UK)
Ranking: 9

Higgins: 0 Ranking Titles, 0 Non-Ranking, Total: 0
Triple Crown Wins: 0
Ranking: 51

Williams: 0 Ranking Titles, 0 Non-Ranking, Total: 0
Triple Crown Wins: 0
Ranking: 58

End of 1994/95 Season:

Ronnie: 2 Ranking Titles, 3 Non-Ranking, Total: 5
Triple Crown Wins: 2 (1993 UK, 1995 Masters)
Ranking: 3

Higgins: 3 Ranking Titles, 0 Non-Ranking, Total: 3
Triple Crown Wins: 0
Ranking: 11

Williams: 0 Ranking Titles, 1 Non-Ranking, Total: 1
Triple Crown Wins: 0
Ranking: 39

End of 1995/96 Season:

Ronnie: 2 Ranking Titles, 4 Non-Ranking, Total: 6
Triple Crown Wins: 2 (1993 UK, 1995 Masters)
Ranking: 8

Higgins: 5 Ranking Titles, 0 Non-Ranking, Total: 5
Triple Crown Wins: 0
Ranking: 2

Williams: 1 Ranking Title, 1 Non-Ranking, Total: 2
Triple Crown Wins: 0
Ranking: 16

Maybe it would be better in each season if you include the number of titles they won. For Higgins in 1995/1996 it is first read as if he won 5 ranking titles in 1995/1996 but he won 2 that season. I then assumed you meant he won 2 that season as his total ranking titles to date was 5.

Good shout Arsenal, let me try that:

End of 1995/96 Season:

Ronnie:
Season Titles: 0 Ranking Titles, 1 Non-Ranking, 0 Triple Crowns
Total Titles: 2 Ranking Titles, 4 Non-Ranking, Total: 6
Total Triple Crown Wins: 2 (1993 UK, 1995 Masters)
Ranking: 8

Higgins:
Season Titles: 2 Ranking Titles, 0 Non-Ranking, 0 Triple Crowns
Total Titles: 5 Ranking Titles, 0 Non-Ranking, Total: 5
Total: Triple Crown Wins: 0
Ranking: 2

Williams:
Season Titles: 1 Ranking Title, 1 Non-Ranking, 0 Triple Crowns
Total Titles: 1 Ranking Title, 1 Non-Ranking, Total: 2
Total Triple Crown Wins: 0
Ranking: 16

End of 1996/97 Season:

Ronnie:
Season Titles: 2 Ranking Titles, 1 Non-Ranking, 0 Triple Crowns
Total Titles: 4 Ranking Titles, 5 Non-Ranking, Total: 9
Total Triple Crown Wins: 2 (1993 UK, 1995 Masters)
Ranking: 7

Higgins:
Season Titles: 1 Ranking Title, 0 Non-Ranking, 0 Triple Crowns
Total Titles: 6 Ranking Titles, 0 Non-Ranking, Total: 6
Total: Triple Crown Wins: 0
Ranking: 2

Williams:
Season Titles: 2 Ranking Title, 0 Non-Ranking, 0 Triple Crowns
Total Titles: 3 Ranking Titles, 1 Non-Ranking, Total: 4
Total Triple Crown Wins: 0
Ranking: 4

End of 1997/98 Season:

Ronnie:
Season Titles: 2 Ranking Titles, 1 Non-Ranking, 1 Triple Crown
Total Titles: 6 Ranking Titles, 6 Non-Ranking, Total: 12
Total Triple Crown Wins: 3 (1993 UK, 1995 Masters, 1997 UK)
Ranking: 3

Higgins:
Season Titles: 3 Ranking Titles, 1 Non-Ranking, 1 Triple Crown
Total Titles: 9 Ranking Titles, 1 Non-Ranking, Total: 10
Total: Triple Crown Wins: 1 (1998 Worlds)
Ranking: 1

Williams:
Season Titles: 0 Ranking Titles, 2 Non-Ranking, 1 Triple Crowns
Total Titles: 3 Ranking Titles, 3 Non-Ranking, Total: 6
Total Triple Crown Wins: 1 (1998 Masters)
Ranking: 5

End of 1998/99 Season:

Ronnie:
Season Titles: 0 Ranking Titles, 1 Non-Ranking, 0 Triple Crown
Total Titles: 6 Ranking Titles, 7 Non-Ranking, Total: 13
Total Triple Crown Wins: 3 (1993 UK, 1995 Masters, 1997 UK)
Ranking: 4

Higgins:
Season Titles: 2 Ranking Titles, 3 Non-Ranking, 2 Triple Crown
Total Titles: 11 Ranking Titles, 4 Non-Ranking, Total: 15
Total: Triple Crown Wins: 3 (1998 Worlds, 1998 UK, 1999 Masters)
Ranking: 1

Williams:
Season Titles: 3 Ranking Titles, 0 Non-Ranking, 0 Triple Crowns
Total Titles: 6 Ranking Titles, 3 Non-Ranking, Total: 9
Total Triple Crown Wins: 1 (1998 Masters)
Ranking: 3

End of 1992/93 Season:
Best Ranking: Ronnie (57)
Most Ranking Titles: N/A
Most Titles: Ronnie (1)
Most Triple Crowns: N/A

End of 1993/94 Season:
Best Ranking: Ronnie (9)
Most Ranking Titles: Ronnie (2)
Most Titles: Ronnie (4)
Most Triple Crowns: Ronnie (1)

End of 1994/95 Season:
Best Ranking: Ronnie (3)
Most Ranking Titles: Higgins (3)
Most Titles: Ronnie (5)
Most Triple Crowns: Ronnie (2)

End of 1995/96 Season:
Best Ranking: Higgins (2)
Most Ranking Titles: Higgins (5)
Most Titles: Ronnie (6)
Most Triple Crowns: Ronnie (2)

End of 1996/97 Season:
Best Ranking: Higgins (2)
Most Ranking Titles: Higgins (6)
Most Titles: Ronnie (9)
Most Triple Crowns: Ronnie (2)

End of 1997/98 Season:
Best Ranking: Higgins (1)
Most Ranking Titles: Higgins (9)
Most Titles: Ronnie (12)
Most Triple Crowns: Ronnie (3)

End of 1998/99 Season:
Best Ranking: Higgins (1)
Most Ranking Titles: Higgins (11)
Most Titles: Higgins (14)
Most Triple Crowns: Higgins and Ronnie (3)

In the 90s

On one occasion, Williams was above Higgins (end of 1992/93 season)

One 2 occasions, Williams was above Ronnie (end of 1996/97 season and end of 1998/99 season)

*Correction
End of 1998/99 Season:
Best Ranking: Higgins (1)
Most Ranking Titles: Higgins (11)
Most Titles: Higgins (15)
Most Triple Crowns: Higgins and Ronnie (3)

End of 1999/00 Season:

Ronnie:
Season Titles: 2 Ranking Titles, 0 Non-Ranking, 0 Triple Crown
Total Titles: 8 Ranking Titles, 7 Non-Ranking, Total: 15
Total Triple Crown Wins: 3 (1993 UK, 1995 Masters, 1997 UK)
Ranking: 4

Higgins:
Season Titles: 2 Ranking Titles, 1 Non-Ranking, 0 Triple Crown
Total Titles: 13 Ranking Titles, 5 Non-Ranking, Total: 18
Total: Triple Crown Wins: 3 (1998 Worlds, 1998 UK, 1999 Masters)
Ranking: 2

Williams:
Season Titles: 3 Ranking Titles, 0 Non-Ranking, 2 Triple Crowns
Total Titles: 9 Ranking Titles, 3 Non-Ranking, Total: 12
Total Triple Crown Wins: 3 (1998 Masters, 1999 UK, 2000 Worlds)
Ranking: 1

End of 1999/00 Season:
Best Ranking: Williams (1)
Most Ranking Titles: Higgins (13)
Most Titles: Higgins (18)
Most Triple Crowns: Williams and Higgins and Ronnie (3)

Williams now has more ranking titles than Ronnie

All 3 are equal in Triple Crowns at the end of the season

After the UK Championship win for Higgins in 2000, for the first time, Higgins is the outright Triple Crown leader:

Higgins: 4
Williams: 3
Ronnie: 3

End of 2000/01 Season:

Ronnie:
Season Titles: 2 Ranking Titles, 4 Non-Ranking, 1 Triple Crown
Total Titles: 10 Ranking Titles, 11 Non-Ranking, Total: 21
Total Triple Crown Wins: 4 (1993 UK, 1995 Masters, 1997 UK, 2001 Worlds)
Ranking: 2

Higgins:
Season Titles: 1 Ranking Title, 0 Non-Ranking, 1 Triple Crown
Total Titles: 14 Ranking Titles, 5 Non-Ranking, Total: 19
Total: Triple Crown Wins: 4 (1998 Worlds, 1998 UK, 1999 Masters, 2000 UK)
Ranking: 3

Williams:
Season Titles: 1 Ranking Title, 0 Non-Ranking, 0 Triple Crowns
Total Titles: 10 Ranking Titles, 3 Non-Ranking, Total: 13
Total Triple Crown Wins: 3 (1998 Masters, 1999 UK, 2000 Worlds)
Ranking: 1

End of 2000/01 Season:
Best Ranking: Williams (1)
Most Ranking Titles: Higgins (14)
Most Titles: Ronnie (21)
Most Triple Crowns: Higgins and Ronnie (4)

This is the first time, the 3 players are 1,2 and 3 in the rankings.

Stephen Hendry didn't win a ranking title in 2000/2001