Raging Blast series had superior models overall, just in RB2 (even tough it was my favorite game in the series and last one before I bought XV after me ignoring the franchise releases), the plastic shaded look was kind of strange. But Ultimate Tenkaichi, even tough I have skipped the game, looks marvelous still.
Xenoverse impressed me on release with the movement animation, that is definitely better than RB as it isn't as stiff like action figures but looked more like the actual series. Seeing Goku being fast, doing melee, vanishes and sommersaults, that was something refreshing and felt live.
True, Kakarot is kinda poor visually, tough I like the vibrant colours. But models look off in animation and cutscenes and transformations are basically swaping one model for another... well, Xenoverse does the same honestly and only Saiyans can transform (hair model switch) except for CACs (model swaps), but still I can understand it in a huge roster game which is based on custom editing, but in game oriented on cinematics and the original anime experience, that is lazy and look bad when in video outside of the gameplay. I liked some things about Kakarot and playing probably the closest thing to Legacy of Goku, tough it leaves a lot to be desired. Like having the pirate robot as a substitute for basically all the robots and call the same robot Pilaf Machine (even tough Pilaf Machine has it's own and completely different design in the series) and many lazy visual ideas in there... I have lot to say about Kakarot, but won't go off-topic.
For me, the best character and in-game designs go to Raging Blast series on second place and of course and without competition, FighterZ. FighterZ is spot on with everything.