It's a shame your number one reason is customer support, when at least in my experience it has been woefully lacking.

Despite having a reasonably large contract with them at work, we had multiple support tickets go without response for months, with at least one that I am aware of being left open for almost 2 years before being closed as "won't fix"

Noting that its only my personal experience I am sure plenty of others have had the opposite experience, however I have found canonical support to be vastly superior as as such I would never chose RH if support was the primary thing I was after.