This is an old debate.....
There's a lot of hype about shaft cars. Sometimes, it even sounds like people believe that a shaft car will take them directly to the top of the podium.
A couple of facts:
Shaft cars feels more direct to throttle input, than belt cars.
Shaft cars got less friction at lower speeds, while belt cars are more efficient at high speeds.
Some people claim that shaft cars require less maintenance. But belt cars with sealed drivetrain, like the XXX-S, almost dont require maintenance (only a belt tension sometimes).
Many shaft cars have more or less problem with torque steer. Even the TC3, which got un-symmetrical suspension geometry, to counter act for the torque steer.
Usually belt cars are less noisy.
At the moment, there's a lot of hype about shaft cars. But the truth is, that it's about driving style. Some peoples driving style are better suited for shafts, other people are driving better with a belt car.
As a stating point, belt cars are a little more forgiving to driver input, thus better suited for beginners.
Schumacher Mi5 - Sanwa MT-4 / RX-462 / KO Propo PDS-2123 - Nosram 5600 X-treme Saddle Pack - LRP SPX Zero/X12 17,5 - Nosram Stealth Touch Evolution - MAAS SPS 9250