Sasuke is Naruto's antithesis which means "opposite." He wouldn't want to use Naruto's techs. He wouldn't want to use Sage Mode if Naruto already has it.
It's like if Sasuke used the Rasengan. Although I imagine he could copy it, Sasuke would rather kiss Sakura then to use one of Naruto's moves.
It's like if Sasuke used the Rasengan. Although I imagine he could copy it, Sasuke would rather kiss Sakura then to use one of Naruto's moves.