You are opening a door on to a chamber filled with irreconcilable opinions.
In the motorcycle world there are three main camps, belt believers, chain believers and a silent, apathetic majority, plus a small group of radicals who believe both sides are wrong and shaft drive is the way to go.
Much opinion is supported by adherence to outdated and illogical beliefs held dear by proponents and opponents on both sides. Much “evidence” is used by both sides, most of it unsupported by fact or rational analysis.
I’m not going to get into this debate, other than to comment that my car has a shaft drive!