I have ridden both. I prefer the segway, and on most counts, since this is a segway enthusiasts forum, I think people here will agree.
The T3 is a stand up tricycle. The physics are all wrong for that to be stable in turns, and it is not.
Anyone who rides a bike or motorcycle knows that you have to lean into turns. The T3 does not facilitate this.
A car does not lean into turns. (except very high end, high tech ones that do a little) A car does not, because it weighs hundreds of times more than the rider, and it can fight against laws of motion and weights and has the excess horsepower to do so. Still, in doing this, it is very inefficient.
When you get to a smaller conveyance, like a segway, T3, bike or motorcycle, the weight of the rider is a significant issue relative to the weight of the device. Since there are not 4 wheels and a wide stance, turns can be more unstable.
I have seen that T3 can go faster on a straight run, but because it needs to slow down to maneuver, and has difficulty stopping on a down grade, I believe the overall points go to the segway.
I have had an occasion or two to challenge a T3 at a parade to a race of sorts, among the typical city obstacles, like curbs, curb cuts, poles in the sidewalk, pedestrians, and the like. Most times the challenge went unanswered, but the few times it was accepted, I won. The more straight runs, the more disadvantage I had, the more turns and incline changes we had, the more disadvantage went to the T3.
And, I am biased in that I do not like the extra size and horrible maneuverability of the T3 when compared to a segway.
Of course, there are all sorts of opinions out there. I suspect that on a T3 forum, they may feel that the T3 has advantages over the segway. They would be wrong, but that is still their choice.
