For a beginning grower, I think the ooze tubes/gators provide a greater aspect of portability. While I figure out where I am putting what, or if I decide to move things, all I have to do is move the ooze tube/gator. Whereas, if I had the system inground/lying above ground I may potentially waste material because I moved things around.
Pros/cons to both systems, but prior to today I had no idea the ooze tube even existed, but it provides a great resource for watering if you are going out of town, etc. Don't have to worry about a water line being turned on, etc.