I was a little apprehensive before choosing this over OP 3t, but I am glad I made the right decision. On paper OP 3t is way ahead of this but in day to day usage you will hardly notice any difference. For me battery life, display and thermal efficiency were priority. Oneplus because of the 821 gets warm with normal usage whereas this one stays cool. Also the UI is very fluid and battery last for entire day with around 6 hr SOT. I dont really play games, so 6 GB ram with 821 cpu was an overkill for me.