I've only played Wind-Waker, but from the art-style alone i'd put Okami over Wind-Waker, it just simply looks gorgeous. Not that Wind-Waker doesn't, but Okami simply looks a lot more striking to me.
NNID: b00moscone
Switch ID: SW-5475-6755-1986
3DS friend-Code: 4613-6380-5406
PSN: b00mosconi