Belt drive ended up last here, but scored high in the fact that it was easiest to service.

https://www.hotrod.com/articles/ccrp-0510-camshaft-drive-comparison/

Machinist in town here has a 7 second car that had a fixed idler gear drive and he tried a belt drive to see what the hype was and his car lost a little 60 ft time. Put the gear drive back in and the car ran like it used to. His thought was the belt was stretching on launch and changing the timing.