I had an LG G2 and switched to NExus 5x. Performance is much better, and I am really enjoying the phone on Project Fi (From PagePlus aka Verizon). However, I have an iPhone 6 as a work phone. I perfer android over iOS. The battery is great on the iphone 6, and I have noticed the 5x is another android device that doesn't do as good on battery. Especially if you use it much. I don't know what you guys are doing on it, but average use of web, text, facebook, etc the 5x is easily just as good as the iphone 6. In fact there isn't a massive differnce in day to day use from my LG G2 that was on crDroid (Marshmellow). The 5x is faster on heavier apps and installing, but just surfing and texting it's nearly the same. I just wanted the better camera and project Fi, and off custom roms. I'm sick of hacking my phone to try to get a smoother device. That's why I went Nexus. I also think the camera is better on the 5x vs the 6s.
Just be warned you might get the yellow screen problem on a 5x. I did, and they quickly overnighted a new one. Awesome service!