Which variant should i study for paper F4 ?

It really depends where you are in the world!! 70% of the English & Global variant contents are the same, as each country has it’s own law there are some differences from the english and the global which it depends on the country you are living in or you are considering working in.
I just finished the knowledge papers and I’m now preparing to get started with the skills module and I think it’s better to study for the English variant.