HELP - I cant decide

Hi
I need some help/info on which phone i should upgrade to. Now i know its my decision and people will say i shouldnt be asking such a question, but its more a technical thing.

Im into customising the phone, root, custom roms etc and have no problems with samsungs, so am leaning to the s6.

But i would like to know about LG G4, Sony Xperia Z3 and HTC One M9, or maybe one you can recommend.

I had a HTC M8 and found rooting and customising very difficult, has this been made easier without the very real possibility of bricking.

Never had LG or Sony before so is this as easy as Samsung on these devices or is the S6 the way to go.

Any advice/comments would be appreciated as there are so many options it all gets a bit confusing.

Thanks in advance

Trying to decide

The s3 I have is about two years old and I'm pretty sure that time has taken a tole on the battery. I'm only getting around 3 hours of screen on time with light use while running aicp 10 (lollipop 5.1). So I thought it might be time to get a new battery. I'm trying decide between the RAVPower 2250mAh and the Anker 2200mAh. What do you guys recommend?