Depends on what you can afford. Foam mattresses are easy, b/c you can have them shipped, but you can't try before you buy. Hybrid mattresses are popular. They have springs inside and foam on one side. You can't flip them over, like you can with old-fashioned mattresses. Recently, I saw in a Goodwill thrift shop, a decent hybrid mattress for little money. They have a deal with a US manufacturer. I know this b/c I needed a new mattress a couple of years ago. In the process of looking, I found a couple of online sites comparing different brands and types. I seem to remember they weren't affiliated with any sellers. If I'd saved the links, I'd share them. Figuring out exactly what they're selling and comparing between brands is complicated. Good luck. P.S., Low-quality foam deteriorates quicker than pricier foam.