I don’t usually like to recommend youtube reviewers because they most often tell you only what they like about their gear, but don’t survey the landscape for different options and so don’t help you understand what the best options out there are. Even when they do, they usually don’t look at all factors (in this case, comfort, actual warmth vs r-value rating, noise, weight, durability) or test the gear under varied conditions.
I think sleeping pads are a rare counter example and these reviews seem trust worthy despite the “winner vs loser” style presentation: https://www.youtube.com/watch?v=b1-Sgkq72Qc
He deep dives in different pad categories in other earlier videos. Here is the ultralight one: https://www.youtube.com/watch?v=HzvxasO_5t8
His are the best pad reviews I’ve come across.