Retail. You'll regret it when you buy everything digitally and lose it all at once with your 3DS.

Digital = Virtual and Intangible. I will ALWAYS want PHYSICAL RETAIL versions of MY games! As a 35 year veteran of video gaming, I can tell you that my Atari and Intellivision games still work when I play them, as do my NES, SNES, Sega Master System, Sega Genesis, 3DO, Playstation, PS2, GameBoy, Gameboy Advance, and hundreds of others. How bad it would have sucked to have them as only digital. Times change, people change, technology changes, but when you have a physical, tangible version of a video game, it is YOURS, forever. And 20, 30, or 40 years from now, you can still play it, long after the digital copies have been lost on systems that died ages ago. Game developers are simply going cheap by selling digital games. They pocket significant profits by doing that and the consumer is the one who loses. If that is the future of gaming, I will find another hobby. Or just enjoy the games I already have and never buy any new (digital ones).