I have both and am really surprised that the smaller diameter bullet doesn't fly noticeabley faster.
In the 270 I mostly use 130gr and in the 25-06 mostly 117, about 9% lighter and smaller diameter which should mean more FPS but this isn't true?
The 130gr flying at 3150 is hard to beat by any standards, and now some are pushing them to over 3200. Not sure of their group size.
Also another advantage is the 150gr, if a person wants to step up to moose size game. But on the other end of the spectrum for predator hunting you can get great results with light bullets in the 25-06.
