Which mattress should I choose?

I’m planning on buying a new mattress at Sit N Sleep because they are having a sale right now. I’ve narrowed it down to 2 mattresses. They both feel really good, but I’m curious as to how good a quality each one is. These are both queen size beds. Here’s the lowdown:

#1: Simmons Beauty rest Classic Plush/Firm was 9.99 now 9.99

#2: Sealy Seal Beach posturepedic Firm was 9.99 now 0.39

Why would one bed not be marked down as much as the other? Thank You!!