Guys run chains because they think the GD will make noise and generate harmonics but there is zero proof of it.
In fact, in a thread on yellow bullet Chris Uratchco, who is no poser BTW talked about how inaccurate a BELT DRIVE really is.
The only reason PS doesn’t use them is it takes longer to degree a GD than a belt and it’s harder to change cam timing on the dyno using a GD than a belt.