Have owned IM and own Wolverine currently. Both are fun and I find both difficult. I think you have to be pretty good to have a 30minute game on xmen. Neither is a bad choice really. As far as other fast games have your considered a Tron? Very fun. Personally, my. Ext fast game will be TNA when it is released. Could also consider AFM remake but hat is getting much higher priced than the pins you're asking about. Come to think about it so is Tron and presumably TNA.
Don't think I'm much help honestly.