If both types work about equally well, I would buy the cheaper so I could buy more to practice with. As for which bullet is better, you are not hunting grizzlies in a thicket. You are shooting white tails. Any 180 grain bullet made by more or less reputable manufacturers is going to be more than enough. I killed white tails using everything from shotgun slugs, 100 grain .250s through 180 grain 30-06. The secret is that if the round is accurate and you are using a bullet made for hunting, bullet construction does not make a heck of a lot of difference. I can't speak to FMJ or competition bullets but I would bet they would work just as well. A lot of what is out there is pure marketing hype and personal prejudice at least for white tails.