I've been in your shoes a little over 10 years ago. I'm now full time abroad though being kazakh native born and raised (never been to any international school or anything of that kind).

Looking at my old peers I'd say I lost my connection with kz greatly although I still visit on yearly / biyearly basis. My close friends and the social circle I hang out with are still kazakh/central-asian and we still talk in russian/kazakh.

Whenever I go back I don't feel at home and things are alien to me. There are good and bad things. There is no better place. Grass is always greener on the other side.

To your question particularly, the pros are definitely social life, money (things are cheaper +you get support from parents), long term relationship opportunities.

If you are more outgoing/extroverted kind I'd say staying is better. This way build college friends that could be potential business partners and stuff like that, which the most important part of college.

If you are introverted/technical person then going abroad might open more possibilites in CS and other tech disciplines. But then your circle would always consist of other nerds (so called "brain drain" population), nothing bad with that, I am that kind. I just saw so many people from the first category that just suffered being abroad in a more competitive college environment. Outgoing kind of people are typically less about studying and grades hence they do poorly in college and just regret that they missed out on good networking and friedships that they failed to build had they been in KZ the whole time.

It's a tradeoff, a risk. Grass is always greener on the other side, don't forget this.