I don't think it is power gamey. As a DM I might rule that since you are not dropping to zero h.p while in wild shape Relentless Endurance wouldn't trigger, your wild shape form ends when that form has 0 h.p, you still have whatever h.p you had before wildshaping.
I might go Dire Wolf sure it is only one attack, but you have advantage on it if an ally is within 5' so the same chance to crit but higher base damage.
Giant Hyena though is pretty damn nice, with the monsters you will be fighting at level 2 rampage should be triggered often.
Oh just noticed this was your first post, welcome to the boards.
Half-Orc honestly would be a bad power gaming choice, the ability scores don't match up. You will never need to use your strength score.
I would go human and get a cool feat, mobility might be nice, I might go with Observant it gives you a +1 Wis that can stack with a +1 from human, and +5 to passive perception stacks with the +5 to passive perception for having advantage on perception checks in some animal forms, dire wolf would have a passive perception of 18 and 23 on things based on hearing or smell.