I am so confused.  what's the best version of the game?

Street Fighter Zero 3 / Street Fighter Alpha 3    (Arcade, CPS2)

Street Fighter Zero 3 / Street Fighter Alpha 3 (PlayStation)

Street Fighter Zero 3 / Street Fighter Alpha 3 (Dreamcast)

Street Fighter Zero 3 (Saturn)

Street Fighter Zero 3 Upper / Street Fighter Alpha 3 Upper (GBA)

Street Fighter Zero 3: Double Upper / Street Fighter Alpha 3 Max (PSP)

Street Fighter Zero 3 Upper (Arcade, NAOMI GD-ROM release of the
Dreamcast version)

Street Fighter Zero: Fighter's Generation / Street Fighter Alpha
Anthology  (PS2)

(might have missed a few versions?)

I've heard that the DC, GBA, PSP, re-released arcade "Zero 3 Upper"
have the most fighters,
but the Saturn version has the best looking sprites.