I put a timing gear specifically for the vibration! We had a long trip coming up and we did not have time to swap the engine. The timing gear, with a new camshaft kept the oil pressure up long enough to make the trip. It was very annoying, the noise, and the gear ate almost through the timing gear cover.
Upon getting to our destinatin, we rebuilt the engine, replaced the gear with a chain, and it runs great now.
I have wondered if there is actually an advantage to using a gear vs a chain, or belt. I have never had a chain go, or jump a tooth, and I wonder if any difference is noticeable when running.
I had a quiet gear set, and the vibration in the engine was amazing! I cannot see using one in a vehicle for daily driving for any length of time.