If you could put the hub on the snowmobile and keep weight down in the sled down if pulling the sled is bogging you down. I don’t have a snowmobile but I know pulling my Otter Cabin with my ATV can be a lot harder in deep snow than just running the atv alone.
I know snowmobiles pack a track down for the sled to follow in so it might not be as big of a difference.
As far as fishing in all this snow and slush I see a hub being a wet frozen slushy mess that might be a bigger mess to get dried out than a flipover.
So it depends which issue you’d rather deal with! It’s going to be some work either way.