US: At home 100% sit; out and about, 100% stand.
If it’s not my home toilet, I’m not even going to sit to shit. Lift the seat, put down a layer of protective toilet paper to prevent splash landings, aim, and squat. If they have very clean toilets, like someone’s home, I’ll make an exception, or a clean public restroom that stocks seat liners, I may use them.
TBH, that’s a method of last resort though. If I can wait until I get home, I do. Nice, clean, comfy, got a fancy TOTO bidet; just a better experience.
This only makes me favor copyright reform more. Should really cut that down to 25 years or less; anything from before the 21st century should be public domain by now.