Hi cpaciente,
The first place I would start your research is the mattress shopping tutorial here which has all the basic information, steps, and guidelines that you will need to make the best possible choice … and know how and why to avoid the worst ones (including several that you are considering).
While I don’t have any personal experience with this mattress … I wouldn’t consider it (or any hotel mattress) either. You can read more about hotel mattresses in general in post #3 here. Serta makes their mattress and I would also avoid the major brands even if they made a consumer mattress that was roughly equivalent (see the guidelines here).
You can read more about Saatva in post #1 here and a forum search on Saatva (you ca just click the link) will bring up more information and feedback about them as well. While they would generally be a “better than average” choice compared to most mainstream manufacturers … for most of the members here they wouldn’t be in the “best value” range compared to many of the other options that are available (either locally or online).
You can see my thoughts about airbeds in this article and I would tend to avoid them as well.
Phoenix