Wow, a lot of hate for digital games.
While ultimately, it really depends on the game, I would prefer physical copies. Granted, I'm saying this with Castlevania, Super Mario Bros., Sin and Punishment, Mega Man X, and Gunstar Heroes on my Wii, and that's just the VC. I've got WiiWare games, and XLBA games, including Sonic 2. Some games (Mega Man X) are worth having as a digital copy as well, and some games (Castlevania, Sonic 2) are nice to be able to experience without needing to purchase a console (I only recently got an NES, and it's by retrobit. I want to one day own a regular one, but that may never happen. As for Genesis, I don't really care enough to get one.)
So yeah, I prefer physical, but I don't hate on digital.