The best is ragebred using 2h and multiattack. At lvl 12: 12/7/10/10/10. You still benefit from haste this way. Its very effective from exp. (My ragebred has adopted:tusked) so she has 10/5/8/8/8/8... When she full attacks, stuff dies.
Edit. Claws are a trap IMO I think using a falchion is far superior combined with a gore,bite,and 2 hooves.
My group is allowing the "Improved Natural Attack feat" and the Skinwalkers Claws and the Beast Totem Lesser rage power to all stack to give me 1d8 claw damage for my character so I am not too worried about the claws.
That feat is not actually disallowed.
It would require a houserule to disallow it.
Common mistake though.
well i made a crazy natural attack character. 1 level white haired witch/ rest armored hulk (barbarian). the RP to go down are beast totem and elemental rage. gear to look for tentacle cloak once per day 2more natural attacks, dreadwing fulplate 2 wing attacks and flight for half your armor bonus, and obviously amulet of mighty fists.
by level 10 with the items you are looking at 6NA when not raging, 9NA when raging, 11NA when using cloak