I went with the sewn. The snaps concerned me due to wear and tear. I did not like the idea of pulling the quilt apart and snapping it back and forth, back and forth. Although being able to open up your quilt is a nice venting feature, i just dident picture myself doing this so I went with the sewn. When My feet get hot I just put them on top my my TQ. You do get some more versatility with the snaps but IMHO I'm just a fan of the sewn.
Both options are good options its just which one is best for you
Sometimes I like to hike and think, And sometimes I just like to hike.
Hiking is'ent about waiting for the storm to pass its about learning to hike in the rain.