+1 for in gear, on the side stand in public.
All it takes is one bozo to bump the bike from behind, and there's a good chance that it's going to roll forward and take a nap. Being in gear doesn't help when the rear is up in the air. Plus, having it sitting up like that is just asking for someone to sit on your bike, or pop their little kid onto your saddle "just because".
I do keep it on the centerstand in my garage though.
2012 DL650 Shiro Nakama #27
Ride Report: https://www.stromtrooper.com/ride-reports-route-sheets/79121-footsteps-lewis-clark.html