Korea or Japan? Which country and which language should I choose to learn at 14?

I’m 14 years old and I currently live in France, but I also lived in Miami for two years to improve my English (I’m not fully bilingual yet). For a long time, I’ve been dreaming of living either in South Korea or Japan, but I still don’t know which country would be the best choice for me.

I’m a complete beginner in both Japanese and Korean, so I’d really like your advice:
– Which language should someone my age start with?
– Is one of the two languages harder or “more useful” for integrating into the country?
– For someone who wants to live or work there in the future, which one offers more opportunities?

I’m also considering going to an international high school later on, to keep improving my English and learn Japanese or Korean at the same time. Has anyone here done something similar? Is it a good idea for someone who seriously wants to move to Asia later?

Basically, I’d love to hear your experiences:
Which country do you think is better for a young foreigner?
And what’s the best way to start learning the language (school, immersion, resources, study routine, etc.)?

Thanks in advance for your help!