Long time relationship with the classic capcoms: ST, Vsav, and especially Third Strike, but as far as personal particular favorites: I love Yu Yu Hakusho: Makyou Toitsusen.
3-button Megadrive fighter developed by Treasure- same devs as Gunstar Heroes, Mischief Makers, Sin and Punishment, etc. Pretty much nothing in terms of single-player modes, but it's surprisingly deep with really interesting combo-routes and neutral since you can turn around on command, backwards jump, wavedash, invincible backdash, parry, etc. Uses the same netcode as the arcade games in fightcade, so it's got very servicable rollback. I pretty recently got a detector put in for the english translation version in fightcade as well, so it's got ranked play now too ✌