I´m going with SVC, unlock tons of endings. Pre-fight dialouges, secret characters and many interresting extras. Almost every character is pumped to the max as well. They have almost every single specialmove and dm they´ve even had.
Matrimelee has no training mode (where at least i spend alot of time) and the boss is extremely annoying. The reward for beating her isn´t good enough for trying :/
Also, the supermeter charges mainly form you getting hit or the oponent blocking. Since the cpu is bad at blocking you´ll have to get hit on purpose in order to get som meter and try out your dm´s.
I havent played SSV yet, but i´ve heard that the "story mode" isn´t translated. If you haven´t played SS3-4 before thought, you´ll have many awesome characters to play around with. Does SSV have a trainihng mode?