S7 Edge 935F vs new 935U

I am deciding which one to buy. I do not care about rooting the device. I do care about battery and performance. Planing to use it on USA T-mobile.

So what your thoughts?

Xposed on 935U

Can someone walk me through or point me to a guide on installing Xposed on this phone, originally a 935a? I've managed to screw it up twice and have to reset my phone and getting tired of it. I can't install twrp and I've tried flash fire but couldn't get it to work.

any help appreciated