svelte maybe you shouldn’t get a memory foam if your current one is 10 years old.
mine I just checked from my amazon history is only 4.5 years old and needs replaced soon. it will still be a backup in storage in case I get a lot of house guests.
I simply like memory foam better. It is cozy and you can get in and out of bed without jostling your bedmate(s).
8 inch is too thin. between 10 and 12 inch it becomes a question of looks, they don’t feel different. the 12 inch looks a little nicer and you may prefer to be a little higher up.
I really like this model of bedframe with my foamies. Cheap, easy to assemble and move around, and lots of under bed storage room since it is 14 inches high.