Both sealy and simmons have strong marketing efforts. Honestly, it's best to try the bed at their showrooms, and based on your main needs. For example, whether you have neck, back pains, and light sleeper, etc.. Then it boils down to your budget.
Recently, I just bought the Dunlopillo Latex World mattress. Initially I was quite hesitant to try Dunlopillo as they don't really advertise. Sealy advertise is like every where. But because Dunlop is famous for their latex mattress. So far, it seems good. At least I don't feel so aching now...