hi Samoman,
Both of these are members of this site which means I believe they are among the best value in the country … but for different reasons.
Some people get a suit off the shelf that fits great with some adjustments and is everything they wanted and some people have a custom fitted and tailored suit made to their measurements and for them this is the only way to go. Same with shoes.
As you probably know … I never tell people what to choose when they are down to choices between good and good because it really is a matter of personal preference and all the many parts of your own “personal value equation” (which can help you with how to choose) and this is really the only possible way to choose when you are dealing with preferences and individual definitions of “value”.
I would talk with both of them and ask them all the questions that are important to you and will help you choose between them and then decide which one has the combination of features, benefits, and price that is the best match for you.
Neither one would be a “mistake”, both are great value, and both are probably better value than anything you knew existed before you started your search for your perfect mattress 
Phoenix