Werebears would most likely be physically stronger than werewolves.
Yeah, but what's the point in making two things which are the same? I get that a Werewolf and a Werebear are different in some ways, but a Perk Tree would make that difference in strength to Werewolves so there would be no need for Werebears.
It's a good idea in terms of species of "Were" creatures. As in, Vampires have different clans which ultimately have different abilities, but Werebears are just the same as Werewolves, just slower and stronger.
A better option would be to have more perks when not in the "Werewolf" state. Like, you do more damage outright with all weapons, even if just a small amount. It would be a better option than a Werebear. Making the most of what is already available, or improving what is already available is the way.