The polar bear's 2-3x size advantage overcomes the tiger's superior speed and predator skill.
This is a classic size vs. skill matchup. The polar bear at 1,000-1,500 pounds dwarfs the 500-600 pound Bengal tiger. But the tiger is faster, more agile, and a more experienced predator in terms of technique.
The tiger's ambush style would be its best approach โ getting behind the bear and targeting the neck before the size advantage becomes decisive. In a face-to-face fight, the polar bear's mass and longer reach (on hind legs) give it significant advantages.
In the wild, Siberian tigers (similar to Bengals) have been documented killing brown bears, but typically only ones close to their own size. A full-grown male polar bear is considerably larger than the bears Siberian tigers typically overcome.
The polar bear is 2-3x heavier with proportionally greater strength and reach. Its thick fur and fat layer provide natural armor. Standing on hind legs, it can rain devastating paw swipes down onto the tiger.
The tiger is significantly faster and more agile, with retractable claws designed for gripping. Tigers have documented kills of bears in the wild. The tiger's ambush technique could neutralize the size advantage if it strikes first at the throat.
The polar bear wins in most face-to-face encounters due to the substantial size gap. The tiger could win with a successful ambush, but in a straight fight, mass wins.
Polar Bear also fights
Bengal Tiger also fights