The mattress industry is a big scam. All the private lines & such make it hard to do a valid comparison. The pillow top craze effectively cut mattress life in half. And the prices keep going up.
There is a mattress company in Charlotte (Original Mattress Company) that makes all their mattresses here. They have decent prices and on our king, it has the pillow top on both sides. Had it 9 years now and I'd think about getting a new one soon, but it is still fine. I've made my own ruts and probably don't turn it enough, gotta put that on the to do list this weekend.
The one thing I will recommend is the memory foam toppers from Costco. Two of my sons have Original Mattresses (smaller/cheaper so pillow top on one side - not big enough to make ruts (but I should turn theirs as well. The middle guy had the oldest's old mattress, so we got him a topper and for my bad right shoulder it is really nice. I could probably use a memory foam mattress for myself. It allows me to sink in a bit more without compressing my shoulder as much. Always been a side sleeper and after all the baseball, softball and coaching, my throwing shoulder is a mess.