I moved this to General Discussion as probably a better spot. I can't help you as I never used their security software but from online reading and comments here and there in these forums it boils down to personal choice I think. I've read their forums and quite honestly, the same issues seem to crop up with both brands at some time or another. All I know is McAfee is pretty highly rated at the moment. Soon the brand name itself will be replaced by Intel, who bought the company in 2011, but that will take a while to happen.
I'm an unpaid volunteer by the way.
Good luck ;-)