The Sig Academy’s answer in their Pistol Optics Instructor program (built around teaching rank and file cops/soldiers) is 15y in the black of a B8, which is probably just as much on the merit of the zero as the anticipated skill of the students the new instructors will be teaching. Allegedly a 15y zero will generally converge around 35y (although strelok says more like 50y with PMC 115gr I get in bulk), which is pretty workable for most pistol problems. I tend to use this, but at tighter accuracy standard than the B8 black, with good result for USPSA and 2/3G stuff that usually tops out difficulty-wise with 4” steel at about 40y.
Ultimately I suspect it’s like rifle zeros- everyone has preferences and some zeros have certain strengths or weaknesses. I tend towards a 50y zero on rifle figuring that gets me about +/- 2” within 250y, and a 15y pistol zero puts me about +/- 1” to about 60y, so I’m ok with those.