Define term, "how well they do in comparison". Are we talking:
Total historical dollar amount sales?
Dollars per year sales?
Total historical units sold?
Units per year sold?
Total number of titles sold in the brand line?
Total number of players?
Rabidity of player/fans?
There are many ways to measure "how well a game does". In general, detailed sales information is not available. We only have anecdotal information about sales, and that's not trustworthy.
Well, I'll assume you mean fan-base or... something.
I also like to play Shadowrun, BESM3, GURPS, En Nomine and All Flesh Must Be Eaten for non d20 games. As for d20 games I like Pathfinder, Arcana Evolved and am looking into Iron Heroes.