According to the search results, the most aggressive bear species are:
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Polar bears: They are the most dangerous bears in the world and will attack and eat humans without a second thought. Polar bears are apex predators and the largest bear species on earth.
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Grizzly bears: They are one of the most aggressive and dangerous species of bear that you can encounter. Grizzly bears are territorial creatures and prioritize protecting their domain and cubs. They will stand their ground or attack the enemy themselves when facing a threat.
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Kamchatka brown bears: They are extremely territorial and very protective of their cubs. Brown bears have an unpredictable temperament, meaning that you can’t know for sure if they plan on charging at you or just standing their ground. Therefore, anyone who gets too close to their domain will most likely have a lethal encounter with those apex predators.
It is important to note that most bear attacks occur when the animal is defending itself against anything it perceives as a threat to itself or its territory. Therefore, it is best to avoid confrontations with bears and prevent an attack rather than surviving one.