Help Please... topic

Hii Guys..
I am Not new to Custom Roms..
But I am little Confused about which ROM to Flash and how to Root.
There are manny ROOT methods , but I am confused which one will work..
I was not going to jump on custom ROMs.. But due to the **** 5.0 update I have to..
I am also Bored Of LG UI .
Please Suggest Me The best method to Unlock Bootloader, flash custom recovery.
Suggest me the Best Battery efficient ROM.
Ill Use G3Tweakbox for UI changes..
Suggest me a rom which supports G3Tweakbox.
Thanks In Advance