As others have said here, you really don’t want to match your sleeping conditions to the bag’s rating. The rating in most cases simply means you won’t freeze to death; it is not a comfort rating.
That said, it is my sense that the WM bags are a little closer in terms of comfort/rating. Mine, a Sequoia MF with factory overfill that pushes the rating below zero, was toasty comfortable in the low 20s and I’m sure down to single digits.
I also dislike being cramped, and my bags semi rectangular shape was perfect for me. Weighs about 3 1/2#.
