The Nomad looks just like a piece of junk compared. I don't mean its hardware itself, but its design. That came right out of hell.
The ugly oval buttons, the not so good D-pad, the asymetric screen outline and all around casing. One could not have designed it more ugly than that.
But it serves its purpose as the GT does, plays home games on the go. Just many years later the GT did, and even in a lower quality.
So undoubtly the GT gets its vote here, even if I were a sega fanboy.