Perfomance with a helicopter rotor

Hey guys.
Im doing a iphone game with a helicopter and im using transform.rotate for the rotor.

That’s my question. Which one is much better for mobile performance ?
Use transform.rotate on rotor or use a animation for the rotor ?

thank you in advance

This was asked before. Check this question and Rune’s tests here

Thank you for answer, maybe i didnt use the key words to find this other answer.