Ryu Hayabusa vs Dante, Son of Sparda
Ryu from Ninja Gaiden vs Dante from DMC3. Only default styles allowed for Dante (therefore no Quicksilver or Doppelganger as this would make things too easy for him), but both have maxed out powers and upgrades, weapons and levels, etc.
You can call Ryu a defensive powerhouse, but he has great offensive attacks, and quite a free form combo system once you start G–cancelling a lot of his attack strings. He has brilliant weapons and some nifty Ninpo attacks.
Dante has superb weapons, extreme speed, and shockingly huge amount of ærial raves and free form combos available to him. Each style makes him play extremely differently and use different weapons and tactics.
Who would best the other in a Boss fight between the two?