They have much more health than Yosuke (8300). Yu has much better oki than Yosuke (or Chie). Izanagi oki is hands down the best in the game because it can't be late teched, whereas Chie and Yosuke's sweep into oki can be. Yu has much stronger normals than Yosuke, 5B and 2B are in a class of their own apart from Mitsuru's A moves, while Yosuke relies on his speed in order to get in and make his normals effective. Yu's combos also all end in knockdown, whereas Yosuke usually has to reset back to neutral. Ziocar is a ridiculously good move that Yu has as well, it beats many moves and leads into big damage with meter.