It depends on whether you plan to sleep alone or share your bed. If it’s just a bed for you, a full or queen size mattress can suit your needs. You’ll just want to consider your room size and budget to determine which is the better mattress for you. However, if you want a mattress for two to share, we have to recommend a queen size bed. Half of a full mattress provides about 27 inches of sleeping space—that’s about as wide as a crib mattress and almost a foot narrower than a twin mattress. Most couples will feel cramped on a full bed.