What connection type would you choose when buying a new external hard drive?
USB 2 isn't very fast, but Apple seems to be de-emphasizing Firewire and eSATA isn't even an option on anything except the Mac Pros AFAICT.

USB 2 isn't very fast, but Apple seems to be de-emphasizing Firewire and eSATA isn't even an option on anything except the Mac Pros AFAICT.