Another vote for .223 if you're doing the varmint thing. Economical rounds and very little kick. Be sure to consider the weight difference between the rifles especially when adding optics. If you're going to be spending a lot of time on the bench between hunts, consider the heavier barrel as it'll give you a longer life and require less cooling between shots.
Of course, they're all going to group relatively closely when used so the key really is to buy a gun that's good for you and learn where it shoots before you take it into the field for hunting.
Of course, they're all going to group relatively closely when used so the key really is to buy a gun that's good for you and learn where it shoots before you take it into the field for hunting.