We cannot say for sure which between Simmons, Sealy and Serta is the better mattress. I cannot speak for you on what can bring you more comfort when you are sleeping. In fact, it is difficult to find a mattress that provides all the things we need.
However, to acknowledge the question "which is a better choice", I would have to say Sealy. Mind that I have only arrived to this windup due to the lesser complaints thrown at this firm and the higher satisfaction rating they have received. When one is comparing, one should look at the bigger picture.
There as a matter of fact is not that much of a difference. Only that, each have a specific attribute that they excel on. For instance, Simmons offers better spring beds with their beautyrest line. Sealy offers better memory foam and latex technology with their posturepedic line. Serta is just in between.
What you might want to think is what mattress can provide you with the comfort you are seeing for. If you cannot personally test the bed or sleep on top of it for a few minutes, read reviews. This would be a bigger risk since you are not personally testing the mattress out, only taking into notice the opinions of other habitancy who have intimately the same preferences as you are. Remind yourself that comfort is relative.
As for the other vital mattress pointers, Sealy is leading the race. For one thing, there is roughly a unanimous bargain that this firm has the best buyer service. We all know how difficult it is to complain about your purchase once you have already sealed it. It is easier to buy something than return it when it proves to be a useless pile of foams.
According to some people, Serta has the worst buyer service saying that their representatives will have to ask how severe the damage is to the mattress. If the bed is not damaged adequate to their estimation, you will have to pay for some service payment to get man to fix it for you. Also, the return delivery payment falls on the shoulder of the consumer. If you happen to have bought a heavy beds, you will have to spend more on shipping.
I am not an specialist in buyer guides but I know for a fact that it is better to choose a reliable firm that will not lead you to a merry chase when it comes to its warranty. This is probably why Sealy has been putting the others in the shade for quite some time now. They place the interest of their consumers first above all else to make sure that they will come back and buy again from them. That is the whole logic of the over-all satisfaction rating. When more consumers are satisfied, more will advise it and more will keep on coming back.
So in general, you have to test the comfort of the mattress first and get to know more about the reputation of the mattress brand before giving your plastic and have them payment you with thousands of dollars.