I too have owned and liked both. Personally i prefer the 270 mostly for emotional reasons.
However, there is 1 case when it made a difference. When Weatherby came out with the UltraLight Weights, the standard calibers (read 270) came on a scaled down action and weighed 5.5 lbs (handles like a dream) and the magnum calibers were a full pound heavier at 6.5 lbs and did not have the same great feel.
For years, the debate has raged on comparing the performance of the 2 but the point on the previous post showed they are closer than most ardent 7mm fans want to hear.
More importantly, find a rifle you like and it fits you, then see the caliber. I know guys who love Remington pumps in the bush. 270 is only option. If you are looking for a heavy barrel long range shooter, the world is your oyster.
Good luck and let us know what you choose.