UK VS AU (For International Students)

Hey! I'm thinking of studying medicine. I don't care much about the country that I'll study in; however, I do about the competition and acceptance rate.

I know that The United States as well as Canada is not a good choice for international students. I'm considering The United Kingdom or Australia.

What do you think is better in terms of competition, acceptance rate, and UCAT, A-Levels, and IGCSE scores for international students?

I won't apply now or even the next year; however, just curious.

Thanks :)