Home Forums Hunting & Shooting Backpack Hunting Insulation layer under the jacket or over?

For actual specifics,

Kuiu Guide jacket, Get the Kuiu Pro down Parka has an overcoat? (guide jacket off)

Or Guide jacket on with the Super Pro Down ultra underneath the Jacket,

I like the idea of the insulation layer underneath, has long has the jacket is sized properly to not compress the insulation layer too much.

What's working for you guys?