For compatibility and reliability, I would always recommend Enterprise HDD's and SSD's in your server. The Dell branded SSD's have significant price premium so it's certainly understandable to look for lower cost options.
xByte has worked with Edge Memory to have their Enterprise level drives perform correctly in Dell servers. At this point in time that is the only non-Dell branded drive drive we know to work well. They show green lights and do not generate errors in the LifeCycle controller or tools such as OpenManage (All non-Dell branded drives will be reported in tools like Dell's OpenManage as "non-genuine" and show a warning). The Edge drives will cost more than the Samsung EVO 850's, but xByte and Edge will stand behind their compatibility in your R720xd*.
We are in the process of testing some non-Dell branded Intel data center SSD's, but it will be at least a week before I have results for that testing. I have no plans to test a consumer grade SSD like the Samsung EVO 850.
*On the R720xd we have seen a backplane voltage issue when using more than 6 SSD's. The issue has appeared with Dell and non-Dell SSD's. It's an intermittent issue but can create a situation where the server will not power on. We often recommend the 16 bay R720 or 10 bay R620 for an all SSD solution. The newer R730xd does not seem to share this bug.