Hi when you wish to learn a language you should learn the original language not the dialects. As English UK is original and English US is a dialect. I would suggest you to stick with English UK. Once you learn the language you can use according to the location.

Spelling - English English

Pronounciation - Irish

In The Netherlands we learn british-english, but we learn american-english subconciously. (because of the amount of subtitles movies on tv, games etc.)

So most people talk in american-english

here in Dubai mostly people learn America english.but i am learning British English.

Well, I can see that most people here prefer the British English, but I strongly adice you to follow the American English because it's so much easier to understand and speak. For example, every people who speak english around the world can always understand what an American says, but they have a hard time understanding every other types of english. An Australian easily gets American. An Irish can easily get it too. But an Australian doesn't get Irish that well, you see what I mean?
And I personally thought that the british accent was weird, but that was before I listened to australian, irish, scottish, welsh, etc. Lol.
You probably think that I'm American from these things I tell you, but I'm not. I'm European.
Watch many american movies, it's your best training. Be well.

Everytime I moved from Australia to America (or vice versa), I got my -ors and -ours mixed up. lol

I think American-English is a little more rough and simple.
British English seems a little more gentle and sophisticated.

If I were to choose between the two to learn, I'd go for American-English since it can be considered the standard form of English.
... But it really does depend on what you prefer.

In the end, they're basically the same thing... with a few differences.

Scottish and Welsh accents are British accents ._. *sigh*

I don't like how American people spell stuff. I like adding random u's to some words. I normally spell everyday words "British" because I like it better:
humour
gray

Is "color", "colour" in a British spelling?

I'm not going into the topic of the spelling of gray, but I HATE it when people spell it "grey". It's... too annoying.

What I do for the fun of it, when writing on paper only, I spell "with" like "withe". The E is put in naturally from writing. When I'm in class, I always have to erase the E because I've been adding an E for years. lol