Everstar -
If you want fast-paced battles, then you want either ToV or IU.
Tales of Vesperia has "typical" JRPG battles in the way of that you might find a monster party, and you can engage them, which sends you to a battle area. Inside that battle area, you combat the monsters in what could best be described as Soul Calibur or Castle Crashers beat-em-up fighting in a 3d arena.
Infinite Undiscovery, on the other hand, is even moreso like Mass Effect and Oblivion - All battles take place in the normal game world, like Phantasy Star Universe, Oblivion, Mass Effect, and the like. Battles are fast paced and seem to be pretty good from what I've seen of IU, but I have yet to play IU, so I can't fully comment (youtube a few videos of ToV and IU combat to get a good idea as to what's there).
Back from the dead, I'm afraid.
