What is the right choice to use between a Bitcoin payment processor and an exchange wallet, if it so happens that I find myself in a new country or region that is far from the familiarity of language, the regular dress codes and services I once enjoyed ?
What's the best choice between a BTC payment processor and an exchange wallet to use for a migrant?
It's very hard to understand what you are trying to ask. Bitcoin itself is a payment processor. An exchange wallet is also can be used as a payment processor. So, if you're asking which is better, depends on the wallet specifically. But if it's only about keeping your Bitcoin, use a desktop wallet that gives you your keys and those are not the exchange wallets. And about what's best for migrants, there is actually no restriction what you can use. Use what you are familiar with and the most important part, you should hold your keys.