World titles have nothing to do with the car right now. It was the number of teammembers, their class of driving & wrenching and if the team was there testing before.
In my opinion the T4'15 should be the choice for the normal talented driver. It comes not just with flawless quality and durability, but with an awesome basic setup that will initially make you smile. It also has a very thought through design to make your track life easy while it is one of the fastest cars in clublevel and professional racing.
Nevertheless with enough time and addiction you can make any of the actual TCs a race winner. For me and my experience the T4'15 leads the list with the Yokomo BD7'15 in second place; both closely followed by the rest of the competition.