The main reason it beats the others, at least for me is that it is roomy enough to get into any of your "normal" sleep positions. I could never sleep well in mummy bag because you can't get into any position other than straight, not so with this bag, you can move around freely. The added feature of having the sleeve for your sleeping pad is great. When the pad is in place, it works as intended, and it is lovely to roll over, have your bag stay in place, and never roll off your pad. All in all, I am more than pleased with my purchase and look forward to using it every time!