if the "death blows" don't finish one or the other off, then its probably going to switch to sasuke slapping naruto around. and just before sasuke's victory he will go on another rant, said rant will cause to naturo go on one of his "don't underestimate me" bits. afterwhich naruto will somehow pull a victory out of his ass.

as for the issue of superior finishing moves, rasangan wins hands down. Compare the damage to the water towers the first time they attempted to clash with finishing moves. Sasuke did some damage, but Naruto RAPED the damn thing.