Depends on what you are comfortable with. If you are small and don’t weigh much you probably don’t need a firm mattress. You really just need to try some and take your time. Good luck.
We recently bought a SIMBA mattress. Was a little wary of the mattress out a box concept at first but so far so good. Really comfortable. Both my adult children have EMMA mattresses and they both like them too. I should say with both brands we bought the highest spec not the basic versions.
I don't have calcinosis but I've been given an air mattress to combat pressure sores which I find very comfortable. It's a topper on the hospital/community bed they've given me.
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