David_Walter: If you are (or were, 11 years ago?) contemplating buying/Hunting with one or the other of these calibers - I recommend you buy one of each!
I own a pair of Rifles in caliber 25/06 Remington and several Rifles in caliber 270 Winchester and I have owned a "back up" Rifle in 270 Winchester Short Magnum - although I have not as yet Hunted with this 270 WSM.
With today's choices in bullets and powders BOTH of the calibers you are inquiring about are superb choices for medium game.
Yeah, buy one (at least!) of each.
Sorry it took me 11 years to answer your inquiry.
Hold into the wind
VarmintGuy