The .270 Win is a great deer cartridge, especially with 130 grain bullets. That said, for deer, the .30-06 is as good or better, but IMHO, only when using 150-165 grain bullets. Picking 125 (varmint bullet loads), some 180s, and all 200+ grain bullets won't do as well as other calibers with a good deer bullet.
The reason a .30-06 is better for the average hunter is that it makes a bigger hole, helping to find a blood trail a bit better. The 165 grain bullet provides a bit of margin for hitting a small tree with a deer standing close behind it.
That said, factory "Managed Recoil" loads are okay for deer to 200 yards and can make practice more comfortable. They're available for .270 Win, .30-06, and several other calibers. A .30-06 with managed recoil rounds feels more like a .30-30 Win.
For the record, I prefer the .270 Win, probably because I handload and often use bullets that can't be found as loaded ammo. I also hunt where 400 yard shots are more common than in other Maine hunting locations; and usually from very a stable rest. The .270 Win is a flatter shooting cartridge, but under 300 yards, there's little trajectory difference between the '06 and .270 Win. Most people shouldn't be shooting beyond 250 anyway, especially from field shooting positions.