USB loader, I have no plans to ever burn a game again in the future (unless I can't get one to work with it that I really want)
Western Digital drives seem to be the way to go, they have a good combination of price per GB as well as seem to have perfect compatibility. I haven't heard of a single person having problems getting a WD drive to work with the USB loader (myself included) and they run games beautifully. Haven't had a single error yet and I've played games for hours off of the drive. Also, most WD drives don't require external power which is another big plus (at least for me)