Don't own either, but if I were weighing the choices the first question is, do you handload? Pretty clear discriminator on this one. 270 will be much easier to sell should the need arise. I think the 280AI would be cool.
If you're not a reloader you probably don't shoot all that much anyway to make ammo cost a factor in which to buy. If you hang out here for any amount of time you'll realize how easy it would be to sell the 280 Ackley right here in the classified's if that (resale) really motivates you one way or the other with new gun purchases.
