Not Ranked
Gear drives were “*****en” back in the 80’s! LOL, But now they are all but extinct.
Current wisdom is that Belt drives are the best, with chains seconded as they ad a level of dampening between the crank and cam.
The applications where gears are used are pretty limited. I think the Top Fuel guys still use them because of the super high valve train loads, but that’s about it.
It is interesting to me that they still sell gear drives for street applications.
They are known to actually amplify the crankshaft harmonics and transmit them into the valve train.
Jason
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