The liquor selection in B/E is what I like to call Domestic+. You get the same selection of booze brands as on DL's domestic flights with a few upgrades. The cognac goes from VS to VSOP, a couple extra brands of liqueurs are added and, although I'm not usually a wine drinker, I've heard that DL steps up the red/white wine quality and selection a notch or two.
Plus you can usually find a port or two and a fairly decent champagne.
But the active ingredient, i.e. demon alcohol, is the same in all booze so no matter what you choose, the end result will be the same.....
Enjoy your trip!