galaxy note 4 used or lg g flex2??

hi im new on xda, i am going to buy a new phone and i am between galaxy note 4 (used) good condition for 410$ or lg g flex 2 32 gb (new) 345$. i find intresting the stylus but i dont know if i will use it much. i dont care of the screen size or the screen resolution, i just want a phone with high performance and a durable phone for like 2-3 years. I listen that the g flex 2 is much better with 5.1.1but i want to know if it still overheating. So if you have a g flex 2 pls coment your experience with the divice or if you are a well knowing person on android deevicis pls coment wich you will pick. thanks!

HELP...G Flex2 Diesnt have smart screen mode!!!

Hi eveyone.I have just bought a lg g flex2 at&t unlock version.But,I realized that there isnt a smart screen mode at the screen timeout menu.(It closes every fifteen secs. And dont want to close the screen when its lookin)
The fw is 5.0 lollipop.This version of g flex2 (at&t) doesnt have this feature??
Or android 5.0 has a problem??
Help please...