Marvel 3 better
Fewer buttons, chain combos are more intuitive than links, combos get complicated but even the short simple ones are fun, Spider-Man is there, Chun is low tier as she should be.
i still believe third strike is the best fighting game to introduce new people. It's got simple motion inputs, short combos, a complex but easy to understand meter mechanic, and a varied cast that fills most roles in fighting games. It's also just gorgeous and has a great ost