Generally Polar bears.
They measure 2-3metres. Walruses measure around 1.5 metres
The tusks of the walrus could kill the bear, but if the polar bear can get past the tusks it could kill the walrus.
Walrus' don't eat Polar Bears, but Polar Bears do eat Walrus'. A Walrus can defend itself with its tusks, but it is not very effective against a hungry Bear.
A polar bear
A polar bear is able to win in a fight against a small walrus, but usually loses to a bigger walrus such as a mother.
they live in the arctic
The similarities of a polar bear and a walrus are that they both have a lot of fat to keep them warm in the Arctic.Also they can both store food as fat to keep there energy up.
Polar bear
pretty sure grizzly is bigger
On land, the walrus and/or bull, no question. Those large tusks from the walrus and large horns from the bull (if the bull is indeed horned) are more than enough to intimidate and/or kill a polar bear. In the sea, no body because the walrus would swim away faster than the bear could catch it, the bull would drown, and the polar bear would be left holding the bag, so to speak.
Orcas will occasionally kill and devour swimming polar bears.
I would say a polar bear because it can move much quicker and with much more ease.
Whale, seal, walrus.