I haven't done the one hour Segway Tour, but I have done the 2-hour tour twice. Obviously I love it! I really recommend the longer tour, because the time in World Showcase is the best part of the tour!
Here you go, this link will explain the difference between the Segway tours.
Forget the short tour, take Around The World On A Segway! You won't regret it. Don't forget to ask about any discount that you might be eligible for.
I definitely agree on taking the 2 hour tour. Getting to ride outside around World Showcase is just so neat and well worth the extra cost. There are several ways to get a discount so check that out.