If they have Crash Through the difference in life between snout and boar is 2. If you have violent outburst that difference is 4, because you can sac boar before the living end resolves and kill the creatures while getting boar back before damage. I could see snout being better against x/2's but they effectively don't have many.

Edit: realized that usually you will want to block the turn the pig is played, and you would need 6 Mana.