I don't have much room and need a place some family members can sleep on for a while. Anyone know which one?
Ans Of Me: I have had both in the past, and once again. The sofa bed mattress is an air mattress, which should sleep more comfortably.
My son uses the futon and sees to have no issues with it.
My mother has used the sofa bed, and the first one, she honestly didn't care for.
I have learned to sleep on both, and actually, prefer the futon. Our futon is a double mattress. One mattress is the typical futon mattress, and the other has springs - also a futon mattress. We use that one on the bottom..
It may depend on your family members ages.
Have you given thought to a daybed? That uses a regular mattress, and it can be a trundle, which means double space. One mattress hides beneath the other. There are many different styles of frames for these. Check them out!