Hands down the BM857, not even a second thought. I had a greenlee rebadged BM859 (the BM857 big brother) before and the internals are DAMN good. Fluke level of quality.
I'm a big fan of Uni-T for what they are. Cheap, affordable, and decent quality at a good price point. The BM857 blows all of these out of the water, its safe, high high build quality, true precision, etc. It's not even a ball park comparison.