I prefer stock android a lot more than the LG version of android and I like to tweak my phone(without changing roms), so the Oneplus has an advantage here. On the other hand the G flex 2 is the newer phone of the two so it is more future proof with android updates(I think) and it has a better CPU(1G less ram though). In terms of camera and screen, I'm actually not sure who's the better one so you guys can help me out on this. I Also heard that the One plus one has touch issues, so i'm also a bit afraid of that.
Thanks in advance!