I coudl list a number of reasons. But for starters it’s way more fun. 3s relies on a person to be unpredictable and sniff out what areas a person is in.
Parry is the greatest equalizer, the greatest rewards for the greatest risks.
Parrying forces people from the same stupid stuff everytime and allows for the greatest comebacks ever.
sf4 is dull. Same attack strains, priority pokes.
sf2 characters are boring as hell.
OMG, BLANKA BALL AND LOW FIERCE!!!
3s characters have a certain style of play that’s really pleasing to both watch and perform.
oh and playing sf4 WILL make you suck at 3s.