sf1
ww hf s st hdr
ng si 3s 3s2
4 s4
a a2 gold a3 upper(?)
ex ex2 ex3
Not sure if upper fits, but 19-20 officially released street fighter games, only 3 of which are minor revisions. Not sure if the ex series got any revisions.
123456
t1 t2
dr br
10 Tekken games. Not sure on minor revisions.
Going by pure fighting games the score looks to be 10 to at worst 15, if you really don't want to count hdr. Capcom has more street fighter crossovers though.
cvs cvs2
xvssf mvc mvc2 mvc3
cfe
sfxt
tvc
Each side should only count their sfxt/txsf, although whoever makes the third would get to include it, but that's a long ways off. I'm probably missing several games. I can't think of any tekken crossovers aside from txsf, but I think there was one that no one cared about that I can't recall right now.
I'm not sure how number of games released has anything to do with community size though. The street fighter fan base was more spread out with people playing ST, 3s, Alpha, and CvS2, althogh most seem to have converged on 4 for the time being. If any of the older tekken games still get a decent amount of play I'm not aware of it.
Tekken, Virtual Fighter, Mortal Kombat, King of Fighters, Street Fighter, Marvel versus series. Anything else is either new or not mainstream enough to bring up in this topic.
Tekken is a 2d game with all of the stereotypes of 3d games. VF as well to a lesser degree.
Yay for random discombobulated thoughts!