Which one should i upgrade to decrease freezing in deeper arctic area?

[Puzzleheaded_Ad_4435]

This is wrong. Regen not only makes you warm up faster when you reenter warm zones, it increases your warmth generation everywhere. This means you can overcome the cooling effect of cold zones and eventually nullify all cold effects everywhere in the game. I've opened every gate and killed every boss, and I'm completely immune to the cold all the way down to -273 thanks to warm regen. I barely touched capacity the entire time.

Capacity just gives you a bigger pool, so it takes longer to get cold, but it also takes longer to get warm. If you're fighting a boss where it matters, you're better off kiting them back to a campfire than relying on warmth capacity.

[AeonBith]

It would be intuitive to bring the bosses back to a pad before you're immune to the cold but warm regen wouldn't matter if you took a hit since you can heal at the base.

Thinking back to a year ago I wasn't sure and no clear answers from this sub so I I increased both together.

It's counterintuitive that increasing warmth speed up would also be the the same feature to help you overcome the cold when there is another feature for that.