If it were me, since there's only a 5oz difference in weight between the incubator and pheonix, I'd carry the quarter pound for piece of mind I will be completely warm.
That being said though, for a summer application I would get teh partial length JUST because I don't really NEED to be bundled up and my jacket over the footbox would do the same job my full length would do and I trust it'll be warm enough that it will do the job by itself.
For one quilt for most versatility if you're not winter camping, I'd go full length 20*
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