Is Arcteryx proton warmer than Atom?

I'm curious to know if the Arcteryx Proton is warmer than the Atom. As someone who spends a lot of time outdoors in varying temperatures, I'm always looking for the best gear to keep me warm and comfortable. Both the Proton and ATOM are highly regarded for their insulation and versatility, but I'm wondering if there's a significant difference in warmth between the two. Is the Proton designed to keep you warmer in colder conditions, or is the difference negligible? I'd appreciate any insights you have on this topic.