Its pretty funny how much argument you can have over a family of cartridges that are all the exact same case, just neck down to different diameters. There is only 0.031 inches (1/32 of an inch) difference in diameter between a 270 Win (0.277) and a 30-06 (0.308). But boy does it cause a ruckuss.
I personally like the 270 Win but that would be because of the type of flexiblity it give me. I can load them real light and fast for Varmints and yet still have a gun that will take any animal in North America if I do my part resposibly. Most of my hunting will be groundhogs, and Coyotes and some deer hunting each year with an occasional elk hunt thrown in. The 270 can acomplish all of these task fairly well. It is a very well established cartridge you have a wide selection of firearms and ammunition to chose from. The only cartridge with a wider choice of guns and loads I can think of is the 30-06.
Just my $0.02