I encourage you to consider day beds instead of a futon! Granted I’ve only had a crappy one but it wasn’t a comfortable bed or couch they are sorta the worst of both worlds. In a daybed you can have the best of both worlds of an actual mattress and it being a couch. I’m pretty sure I’ve slept on this one before and what’s nice is they put a memory foam or foam topper over it when the bed was extended so you didn’t notice a crease from the two mattresses. Idk what they did with the topper when it was couch mode maybe just folded it in half. I could try finding out if you want.

Or get an actual pull out sofa. If price is an issue though daybeds have about as variation in price as futons when I last did my research.