Gauntlets that go well past your wrists are better than gloves on a really cold day but ski gloves tend to lack the sensitivity needed for fat biking in the cold. Buy something that is very slightly generously sized and you’ll have space inside for a close fitting silk liner without cutting circulation.
Some Hestra gloves come with a separate fleece liner and still have room for a further liner; another advantage is that the fleece liner can be removed for washing.
For biking here on properly cold days, I’ll use a pair of lobster claws like the Sealskin ones but with the extra liner once the temperature is below about -12C and it’s windy.