I think that the first is a closed, proprietary product based mainly on BSD-style code and the other are services centered around the evolution of a free GPL-like product that remains free speaks for itself.
I probably wasn't very clear. I'm not trying to say the technology is bad; simply that success in the market is due to the marketing and not to the technology. Others who are selling the same or similar technology haven't had the same market success as either Apple or Red Hat.
Of course, marketing is important. Apple also has very sexy hardware on its side, something RH doesn't. People basically buy Macs and they happen to come with OSX just like people buy Dell and that happens to come with Vista by default.
You have to actively choose anything else if you want to run it.
