I'm of the general opinion that the only RAID you should generally consider are 0 (YOLO mode), 1, and 10.
RAID5 and 6 are a crackhead playing the shell game with your storage. They use a bunch more IO and are more likely to incur simultaneous drive failures.
It's not guaranteed that RAID10 will survive 2 concurrent failures, but it is less likely for that scenario to happen to begin with.
No matter what you do, make regular backups. RAID is not a backup.