Hi lvka,
This would really be a preference choice and not so much a “better worse” choice.
When you can’t test an online mattress (or a very similar mattress) in person for PPP (Posture and alignment, Pressure relief, and Personal preferences) then the best source of guidance would be a more detailed conversation on the phone with a knowledgeable and experienced retailer or manufacturer who can talk to you about each of your options and help you decide which one would be the best “match” for the parts of your personal value equation that are most important to you (see mattress firmness/comfort levels in post #2 here). They will know more about their mattresses and which ones are most likely to work best for you (based on the information you provide them) than anyone else.
There is more about the pros and cons of a two sided mattress in post #3 here and the posts it links to. A two sided mattress will generally last “significantly” longer than a similar one sided mattress that uses the same materials and components but only has a comfort layer on one side.
Phoenix