looking for tips for what to go on the “which one fits best” shortlist.
Well, your shortlist should include ones which fit best. Which rules out the advice of almost anyone above (And below!) as they don’t know the shape of your head. You do. Go to a bike shop. Try some on. If they fit your requirements*, and more importantly, fit your head, choose the one you like, then buy it. From that shop. If that shop doesn’t have anything that fits both head, requirements and wallet, go to another and repeat the process as before.
*Despite the point re advice, your requirements make it trickier. Bug mesh helmets are few and far between, especially on better helmets, oddly. Remove the bug mesh requirement, add a Buff or twelve to your kit list and you’ll be fine.