  Chris2016b, The benefit of the raid 6 really boils down to an additional redundancy, as the raid 5 will allow a single drive failure the raid 6 allows a double failure. Now the Raid 5 is faster on IOPS over the Raid 6, but are a fraction of what you get with a Raid 10.  Hope this helps.
There are some articles, that advice against Raid 5 [1]. What's your experience? Should one choose Raid 6? Are there issues with rebuilding Raid 5? Is expanding Raid 5 working flawlessly? [1] [URL]
Raid 5 today