Mainstays 6 in Twin Innerspring Mattress vs Bedz King 7-Inch Memory Foam Twin Mattress

The Bedz King is the better mattress for most people: all-foam construction, a cooling cover, gel and titanium-infused memory foam, and a no-flip design with a non-slip base. The Mainstays is the better fit for tight budgets and very low spaces, and its innerspring core gives firmer, springier support that some sleepers prefer. The Mainstays has far more owner feedback (4.2 from over 9,000 ratings) and a longer track record; the Bedz King's 4.6 comes from only 10 ratings, so treat it as promising but unproven. Neither is a long-term daily mattress for a heavy adult.

• Choose the Mainstays if you need the lowest-profile option for a bunk, trundle or guest bed and want firm, springy support backed by thousands of owner ratings.
• Choose the Bedz King if you want memory foam comfort, less motion transfer and a cooling cover, and your bed frame can take a 7-inch mattress.