I lived in Turkey for a while and almost every house has one normal toilet and one old school toilets (hole in the floor) which hasn't got a place to sit so you have to squat.
AFAIK also muslims prefer squating over sitting as it's the suggested practice, also they don't pee standing up (I think this is due to health reasons as well but can be about being clean,not sure).
I always prefer squating over sitting however when you get old generally you need to sit as squatting is literally requires effort, many elderly people sits due to this.
I can't imagine squating in a normal sit toilet, that's just dangerous.
Are you imaginining standing on the seat, standing on the rim, or standing on the ground in a martial arts horse stance? Because I can see significant possible problems with all of these. (technically, problems with the last would be due to "lack of muscle conditioning," but not many people are conditioned well enough to stay in a horse stance for long).
The rim. The seat, provided it is solidly built and attached. Anecdotally I feel quite stable either way.
Edit: the trick to perching on various narrow surfaces, for me, is to have the heel on one side an the ball of the foot on the other. "Gripping" as it were.
AFAIK also muslims prefer squating over sitting as it's the suggested practice, also they don't pee standing up (I think this is due to health reasons as well but can be about being clean,not sure).
I always prefer squating over sitting however when you get old generally you need to sit as squatting is literally requires effort, many elderly people sits due to this.
I can't imagine squating in a normal sit toilet, that's just dangerous.