Nords and Orcs have different bonuses and stats, and it was more apparent in Oblivion. Orcs were heavy pure warriors, two-handed weapons mostly in mind. Nords were heavy warriors with the potential to hybrid with being a mage a bit easier, or do shield and sword fighting.
But since Skyrim doesn't have the stats like OB, it'd be harder to make them distinct, you know? Like a Werebear in OB could have Strength and Endurance increased by 10, with Speed and Agility being cut back by, say 5. A Werewolf could have all of those increased, but only by 5 or so.
See what I mean? The mechanics are a little too simple for the variations to really take root. Can you think of any way around that, or to actually make them play differently???
The Werebear transformation could grant you 300-500 more health than its werewolf counterpart and be tied to your heavy armor rating to further its ability to tank hits. It would be a little faster than a sprinting horse, but sprinting consumes its stamina much quicker than say power attacks and whatnot.
Conversely, werewolves would be faster, and have the ability to sneak. Their health would be tied either into their Light armor skill or not at all, making them unable to take the same beating werebears can. On the bright side, they would be able to sprint for hours, as sprinting would consume less of their stamina than it does for horses, humanoids, and werebears, and would be faster on their feet all around.
On the subject of Howls, werebears would have Roars instead, and they would be a little different as well. They should both have the Fear ability, though the werebear one should be stronger. The werebear should also have a disarming roar, and a third roar I'm having trouble thinking up right now. Perhaps one that has a buff on the user instead of the opponents, like a health regen buff similar to Histskin with a long cooldown? I'll figure one out for it later.
Just because the traits/attributes/stats have been dumbed down doesn't mean we should be stuck with only one option. There's plenty of other ways to make werebears different from werewolves, or any other varieties of Lycanthropes that may be introduced in the series.