The good one.

Have 3 850 pro, 1 850 evo. Actually cant tell difference between EVO and Pro performance wise. My one laptop pro, its been used in my laptop since I think the end of 2014 and had all of the windows 10 insider versions installed on it conservatively over 100 times both freshly and as upgrades, each build several ways. ... and used 24hrs a day... showing about 8TB not a single hiccup. Win 10 pro always boots for me in 3 to 4 seconds on that quad core i7 16gb ram laptop. Runs pretty much at spec speeds and spec I/o on reads, but doesn't reach spec max on the I/o writes.. think that's a laptop channels problem. Have an EVO in that laptop as a 2nd drive replacing the DVD and its had over 50 now 2.5gb esd's moved into it for storage and made and stored over 50 iso's, plus some other various windows install iso's and stored a daily image from the win10 installs. DVD connector is only SATA2 so its running half max speed basically - It's worked flawlessly too. So I cant complain. I'm an old guy and retired and hopefully these drives will be around for my funeral.Read full review

Verified purchase: Yes | Condition: Pre-owned