My First electric tc was the T2-007. I loved that is was a champion car and the way it was made. It was a very nice peice. However i didnt take into effect was parts. None of my lhs has parts for this car so it sucks when your at the track and you break that one part that you dont have.
As for the HB its a very nice car as well. I have never owend one but from what i read it is the best on asphalt.
All and all both are great cars. From my opinion since you have owned xray and as long as you can get parts for the car go with the xray. I believe it is a better over all car on all surfaces.