Bear
A fully grown grizzly bear can weigh up to 600 kilograms and run at speeds exceeding 55 kilometres per hour. Their bite force of approximately 1,200 PSI can crush a bowling ball - not that bears typically encounter bowling balls in their natural habitat, but the principle stands. A single swipe from those claws, measuring up to 10 centimetres, can decapitate prey with disturbing efficiency.
Polar bears routinely swim distances of 100 kilometres between ice floes, hunting seals with the patience and precision of a particularly murderous chess grandmaster.
Panda
Giant pandas possess a bite force of roughly 2,600 PSI - actually exceeding that of most bears - a jaw strength evolved specifically for crushing bamboo stems that would otherwise resist consumption. They can, theoretically, cause significant damage to threats, though their preferred response to conflict is typically to sit down and look confused.
Adult pandas weigh up to 160 kilograms, with males occasionally engaging in what might generously be termed combat during mating season. These altercations largely involve falling over repeatedly whilst making sounds reminiscent of a distressed goat.
VERDICT
Despite the panda's impressive jaw mechanics, the conventional bear wins on overall athletic capability by a considerable margin. Bears are apex predators capable of taking down elk, moose, and the occasional unfortunate hiker. Pandas are capable of sitting down slowly and occasionally rolling off branches. The comparison, whilst unfair, is nonetheless scientifically valid.