Ok, so I'm from Croatia. What are my options?
Serbia: It's like a poorer version of Croatia where everyone hates Croats. I have some relatives there, but not a great option.
Bosnia: Even poorer, but people are nicer. Still, no jobs to be seen anywhere, so no.
Slovenia: Lol, no.
Hungary: Not too bad. The new language will be a ***** to learn, but it's not too bad.
Montenegro: Not sure, not much news comes from down there so I'm not quite up to speed on the situation. Still, might not be a bad choice.
Bonus round - Italy: Not a direct land border, but all that separates us is a few kilometers of Slovenia (lol). Might be my best option.
Overall, I'd pick Italy, with Hungary and Montenegro sharing second spot.