I have quite broad shoulders and am on the taller side (185 cm)
Road: 42 c-c; was running 44 on my previous bike but I didn’t notice a major difference, except when really cranking on the bars in a “sprint” or really steep climb. I don’t think I’ll go back as I noticed a pretty big difference going down to the narrow base bars on my Tri bike
Tri: 40 c-c; for race scenarios i’ve never really noticed, but as I have to use the base bars quite a bit for the first ~20 mins of any outdoor ride I do, the bike always felt a bit skittish when going from the 44’s on my road bike. Sizing the road bike bars down to 42 did help with this.
Gravel/ Commuter: 42 c-c, with 15* flare to the drops. Not honestly a huge fan of the flare, but not annoying enough to change
MTB: 780, but feels a touch wide and I keep whacking the ends on trees. May cut ~20 mm off as I find a lot of the trails I ride here in NE have really narrow bits with trees branches right at the edge.