I'm with Cannibal and Mustardman. Adding a differential doesn't take too much extra effort, but it does take a little more time in the design/planning stage. For that reason, maybe it's a bit much for a FIRST quilt project depending on how adventurous the stitcher is. (Stitcher sounds much better than sewer, IMO...
But I think differential designs fit much better than flat-shell designs...you can pull them tight to get a great fit and not worry about compressing the down.
I think it makes better sense for a TQ as well, if you're only talking about fit. And for the same reason...your body is a 3D shape so a 3D quilt will fit it better.
But you do give up multi-use any time you're making something specifically for a single-use. E.g. - the Winter Yeti and MWUQ are great fits for underquilts. But I often use the MWUQ4 as a top quilt as well...can't do that with the Yeti b/c it's not full-length. At the same time, the MWUQ4 fits better as an underquilt than the Stealth...but I can't wear the MWUQ4 as a poncho. So I love the NS and Stealth design and often use them as worn insulation. I like the multi-use design and think it fulfills its role admirably.
That said, you could make a differentially cut UQ that has a poncho hole in it.
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