Which one would win a fight, a polar bear or a grizzly bear?
It totally depends on a few factors, such as the size of each animal and their respective relationship.
If we take for example if the polar bear is 1000 pounds (450 kg) and the grizzly is 2500 pounds (1134 kg), then theoretically it would come down to who was in better shape or who had more momentum. If they were evenly matched, I don’t think either of them could win against another one due to their paws being too small given their limited dexterity when fighting with other bears as well as shorter arms leading to less reach. You’re much more likely to get into an intense brawl with long distance weapons than face-to-face clawing tactic combat with a full grown grizzly bear in Canada or Alaska.