It depends on the area of the game we are talking about.
Story (Including characters): Vesperia > DQXI
Gameplay: DQXI > Vesperia (mostly because Turn-Based > Action for me)
Music: DQXI > Vesperia (This is mostly based on style-preferences, ToV has a good track for its genre.)
Exploration: DQXI > Vesperia
The thing is, when it comes to JRPGs I rank story over all the other qualities. Dragon Quest and Tales of have their own set of tropes, but I think Vesperia did the Tales of tropes better than DQXI did Dragon Quest ones, and Tales of tropes are more interesting. But gameplay-wise DQXI is the better game for me.
I like them both for different reasons then.