Frankly, I'm kinda surprised that the Wby Vanguard is noticeably less expensive than the Remington ADL. :? I know that the Vanguards are essentially Howas, or at least their actions are, but their barrels are not.
I own many remingtons and they have proved to be excellent rifles. Still, the Vanugards are no slouch either. I'd say that, with regard to which rifle, it's a tough call.
With regards to cartridge, the .25-06 may not be as fast as the .257Wby, but, as was stated before, the ammo is not as readily available and even then it is noticeably more expensive. Keeping in mind that the Wby is hotter, if you shoot a lot, then barrel life may become an issue. For these reasons, I would opt for the 25-06.
Back to the rifle selection, I know that it is not on your list, but you should take a look at the Tikka. I own a Tikka Laminated SS, coincidentally in .25-06, and it shoots 1 ragged hole at 100 yards with Federal Premium 117 grain Sierra Boat-Tail ammo. The Laminated Stock is kinda heavy, but perhaps that aids in my better shooting. Still, you can always get the Tikka in the Synthetic Stock, of which most of my other Tikkas are. The quality of the Tikkas are above that of the Remingtons, and the prices are competitive. Still, if you really want the Remington ADL, you can't go wrong.
Zachary