Graces F is one of the weaker Tales, but it'll do in a pinch if you really need a JRPG fix. The combat's not as good as Vesperia's, but it's not bad either. The story, characters, graphics (it's an upscaled Wii port), are all kind of a step below Vesperia, but again they're not really bad. It's a pretty large game and it'll take up a good chunk of your time if you really want a JRPG to play. It's definitely a lot better than shit like Infinite Undiscovery and The Last Remnant at the very least.
Vesperia on the other hand is really just amazing in every category. Beautiful art, great combat, a great supporting cast and an awesome protagonist that isn't afraid to exact his justice upon the world (really don't want to spoil why he's a badass, it's awesome). You should absolutely play Vesperia.