Besides the obvious, the only difference is the axle size. The cassette version has smaller axle on one side, leaving a smaller flat as well. I have one, and it works decently, but I wish they would have fixed that to be the same on both sides.
Get a Cycle Analyst and a Multimeter, you're still a noob if you don't have at least one of each.
Planning on posting questions or buying anything on this site? Put up your country (at minimum) on your profile. This is a worldwide forum and we haven't reached clairvoyance.