Gear drive
I am running one of the CAT gear drives on my Magnum headed 318. I have had no issues so far. After a couple of hundred miles I pulled the motor for a leaking rear seal and I checked the gear drive and shows 0 wear. I think as long as you set it up properly and has good oiling you should have no problems. I like them because you can get your timing exact and don't have to worry about chain stretch and I kind of like the whining.
I have quite a bit of faith in gear drives, because being an industrial mechanic I work with these quite a bit and will outlast many chains if oiled properly. What do you think comes in every cummins that pull you race cars to the track?