[Tzat]

Claw is a focus dump while Bite is not.
What this means is that the damage output of Bite is limited by the ability's cooldown while Claw is not (as long as your pet got focus it keeps using Claw). In a raid situation Claw is essential for your damage output while Bite merely is a minor DPS boost on top of Claw, plenty of hunters even choose to completely skip Bite for more resistance training.

While levelling you want to prioritize Growl so I suppose there could be situations when you might prefer to not use up all your focus on Claw but as soon as you get Beastial Discipline that shouldn't be much of an issue. I'd just train Dash, Claw and Growl when levelling and spend the rest of your training points in Cobra Reflexes, Avoidance, Stamina and resistances / armor (depending on the situation) and only train Bite if you got an abundance of training points (you never want that one on auto-cast alongside Growl). Prowl is cute but very situational.