Memory foam topper vs. pillow-top mattress pad — which is better?

They solve different problems. Memory foam (gel or standard) contours and relieves pressure for side sleepers and back-pain sufferers but traps heat. Down-alternative pillow-top pads add plushness and breathability with minimal contouring, and they're significantly cheaper. Reviewers steer hot sleepers and people who just want 'softer' toward pillow-tops, and back/joint-pain sufferers toward foam.