I'd prefer a hard copy personally, but I also see the advantages of the digital distribution.
I don't vote, as my vote would be for a simultaneous release of both, a DVD- and a digital download-version.
@DRMs
DRMs have always been there e.g. by your agreement to the EULA before installing.

Limited forced online activations is a different matter though and I wouldn't like to have that with SoW. But Oleg already noted that he doesn't like the CopyProtection methods of some recently released titles. He was probably refering to RoF, but I guess he also meant DCS:BS...
Let's face it: We flightsimmers put a lot of money in upgrades and hardware-refits, so IMHO especially DCS:BS is an excellent example of how Devs punch honest customers in the face and do pirating a great favour.