Is there any reason to get the digital over disk anyway? Apart from price.
The two consoles will be identical - the exception obviously being the optical drive. Otherwise specification will be the same.
My opinion:
If the difference is £100 (and they take a hit on each console sold knowing they will make money back via the digital store they know you'll have to use) then it really might be considering. Digital games do eventually get a lower price and there are enough digital sales, but you may find yourself waiting for that "right price". However, the £100 you've saved can go towards digital games.
If the difference is £50, even if you plan on mostly buying digital games anyway, it's probably worth having the optical drive there - in case the "must not be missed" price on a physical game comes up.