Hi it doesn't matter which accent you learn, the fact that you are learning English is commendable.

Usually European people speak British English because that is the closest English-speaking country so their teachers usually come from Britain. No matter which you learn, just as an English-speaker visiting a country speaking another English dialect, or the same for any language, you will have to adapt. The important part is learning the language though, regional differences in vocabulary can be worried about later but, if you have a choice, chose the one which which you expect to have the most interact.

I agree with Jura, it doesn't matter which accent you want to learn. I'm from the U.S. and I'm Canadian too but all the other accents are great as well! All accents are fascinating. Sure there are some colloquial words that differ between us like: US/Canada uses the word "elevator" but in the United Kingdom they say "lift". Other colloquial words and phrases will be different in Australia, New Zealand, South Africa, Ireland, Scotland, Wales, etc but what matters is we all understand each other. So just pick which one is comfortable for you and you'll end up being understood by the rest of the English speaking world.

Beauty is in the eye of the beholder! .

That sounds like a very American thing to say. (I'm American too) The differences in different English dialects barely deserves the word 'dialect.' Whichever one you speak, any English-speaker will understand you.