Yeah. largest Bear vs Great White? Seems that makes a difference although I don’t see how even a large bear would prevail against any moderately sized shark if the bear stayed in the water. Shark would destroy his legs, he would fall down and the shark would eat him in a matter of minutes. No contest
Shark on land = helpless. Bear in deep water = almost helpless.
Depth of water would seem to be a major variable.
A more important issue. Bear vs. Tiger.