I HAD a Hornady, actually went through two of them. They are JUNK in my opinion. Continuous over charges and very frustrating, spend an hour at the bench and get maybe 5-10 rounds loaded. I spent lots of time on the Hornady Customer Service line, and they are decent folks, they had me reprogramming the speeds and timing when it would go from high speed to slow speed trickle and so on but nothing worked. Trashed it and bought the Lyman this past weekend. Very pleased with it so far, and it throws perfect charges according to my Redding balance beam scale. I can even dump a partial charge with my Lee powder dipper and then let it trickle the rest and it is really fast. Highly recommend this one.
I have no experience with the RCBS, but I know a couple fellows that use and like them a lot.