To throw a spanner in the works my current go to (with a long underlayer) is a lightish jumper (usually woollen) and a shell jacket that doubles as a raincoat over the top. Super efficient at keeping out the wind and easy to pack down. I walk everywhere so it’s heaps warm enough the wool jumper is warm for inside.

Other than that I would go puffer first for packability (I love my pea coat but rarely wear it now)