TA05 is better as the design can run faster and the parts is high level than TT01. Later if you want to upgrade these two cars,performance of TA05 is better than TT01 but TT01 is expensive than TA05.You can buy second hand parts to reduce the price. However,if your buget is enough,TT01 s15 or R34 with led kit is your only choice as the price is cheap,body is beauiful,and the performance is not bad!(But don't invest many money to modifly the car)