I currently have both set ups since recently acquiring a 15* 800 fill down sleeping bag. I will be testing the the bag/pad rig for the next 3 nights with temps predicted to be in the high 20's/low 30's. Common for where I"m hiking & fishing this year.
Picture is of Lightning Lake, which is on my bucket list. Will be coming in from the south over the plateau. Trek is 2 days in, 2 days out with stops at other good lakes a little lower in altitude. Lightning Lake is known for its big golden trout.
Will post a review of the bag/pad later. The big problems with the high altitude hikes are high winds and storms with lightning along with an occasional blizzard.