Do you wear your puffy jacket over or under your shell?
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Depends on the puffy. To me there are two types of puffys: Midlayer puffys and glassing puffys.
Midlayers are thinner and are ment to be worn under shells. Designed to be warn while moving in cold temps. I dont use these puffys much as a A solid fleece or flannel can also fill this roll and is better suited- more breathable, doesnt compress over time, more durable, cheaper.
A shell and a midweight fleece will keep you warm at almost any temps if you are moving.
A Glassing puffy is different. In the mountanneering world it would be called a belay puffy. Made popular by alpinist Mark Twight, a good belay puffy (or in our world, glassing puffy) has some key fetures:
-Synthetic fill (or some of the new waterproof down) that is warm when wet, a LOT of fill
-Sized to fit OVER every layer
-Windproof, NOT waterproof, for better breathabliity but still maintaining warmth.
-Durable
this layer is taken on and off all the time, too hot to wear doing anything physical. ITs okay to put this layer on when you are covered in rain or sweat, and it will keep you warm, allow you to dry, and allow you to sit long periods of time with little movment (like glassing).
Kifaru lost park parka fills this roll very well. I use an Arcteryx Nuclei SV jacket (not the FL version, i think the SV is discontuned). Others in this category would be the patagonia DAS parka.