Most police bikes I see in the US are Harleys, I don't think they're buying anything out of practicality. If they were, you'd see a lot more BMW police motorcycles.
https://www.freep.com/story/news/local/michigan/2024/02/15/m...
Lower centre of gravity, some "extra" leg protection in sideswipes | converging hits on roundabouts (from the pots and pot crash bar protectors), and zero chance of chain wear with better direct power pickup | engine braking from the shaft.
These are all grounds for some heated debate wherever two wheels gather, but I'll swear by them.