What’s the best self inflating sleeping pad for backpacking?

My husband and I are 5’8-5’10 and weigh 220-250lbs. I have a horrible back, herniated disks in my lumbar, arthritis and DDD. I need at minimum a 3inch thick pad because I toss and turn and sleep on my side a lot and am tired of my hips hitting the ground on my current air mattress. I’ve been recommended some Thermarest and Exped models on here and I’ve watched some YouTube videos recommending sea to summit models and even some amazon brands like Wellax. Those of you that are a little bigger with bad backs.. what sleeping pads do you recommend?