Which one of them should I get? (I don't play Jungle)
Renekton is strong laner.
Innate sustain, huge burst potential, and a strong off-tank bruiser.
I definitely recommend Renekton if you want to just stomp.
Lee Sin is similar, but he needs to build tanky to be tanky and build damage to deal "tons of damage."
I recommend Renekton if you want to stomp with elegance.
You don't play jungle? Learn. You should know the basics of every role, at least.
I would say Lee Sin, since he can be run top, mid, or jungle, whereas Renekton is almost exclusively a top laner.
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