SF5 is currently the best SF game and will remain such for the foreseeable future.

>Actual footsies
>Interesting mechanics
>No-bullshit lobbies
>Easy to read menu system
>Huge roster with varied, imaginative movesets drawing from across SF's history
>Active playerbase (now moreso after everyone went back to it because SF6 sucks so much ass)
>Full of the sniffiest bitches in SF with the sniffiest costumes
>Chun is the hottest she's ever looked

Game took years to get good, granted, but it is good now.