RAID 0 is fast but gives up some reliability to obtain faster speeds.
RAID 1 is very reliable but gives up some speed in the process.
Unless you need the higher speed of RAID 0 (and are willing to risk the higher possibility of failure) or the high reliability of RAID 1 (and are willing to give up a little drive speed), I would stick with a single drive. The 850 Pro comes with a 10-year warranty, so Samsung obviously has a lot of trust in this drive.