@David_Kingham
See my comment here . The latest Samsung 990 model is showing problems.
One should be fine with either San Disk or Samsung if you stay away from he particular model mentioned. The problems will be addressed but due to shelf life etc. it might be advisable to refrain from those particular models for 6 mos. or so. There is no way to know if the one you buy is of the bad ones unless the mfg publishes the information.
Quoting from the linked item above just for reinforcement.
"I am a retired IT worker. All technology companies suffer from a small amount of failure in their products, so it may be unfair to damn a whole line of product due to one personal occurrence. I have used SanDisk for 2 decades without a failure. That was out of about 30 cards of differing sizes.
Samsung would be my second choice, based on reputation, but at the moment I would hold off on purchasing their 990 SSD due to early failure rates, per Ars Technica. You could go with an older model."
Now I would not purchase the SanDisk shown in the Ars article, but would have no problem buying either brand in the future.