I have both TA05 ver 2 and TA06 pro. If going racing i would go for the ta05 ver 2. Handles quite well but the main thing is that the drivetrain is sooo free compared to the TA06. TA06 is nicely balanced and probs alittle better handling than the ta05 with the center battery but can deffo see the speed difference in that rear gearbox drag, even my old ta04 was quicker in a straight line than ta06 (stock vs stock)
Just my opinion
Cant tell you much at drifting as i dont drift with them cars atm