[Jaydelart]

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.