There is really 3 kinds of English. British English, real American English, and mixed English. Most non native speakers speak mixed English. Because it doesn't have those strong British tones, people often think it is American, but really, it's not. Speaking mixed English is perfectly fine, you shouldn't focus too much on trying to sound British or American, but you should focus on being understood. Most text book for English in China teach mixed English.

There are several different dialects in the US alone. It doesn't matter really, just pick one that you like and stick with it. You will be understood no matter which one you pick

Neither one is "better", despite the bickering. They just follow slightly different conventions. If you want to make a choice, look at who you are actually talking to. Mainly Americans, for example? Then go for the American style. The choice is really that simple. Trying to mix both together or swapping between styles is a huge mistake. We native speakers have one style and we stick with it. We can still understand each other. :)

Who would want to speak 'real' british english? lol

I was interested in english, since i was 6 years old. I wached my favourite Muzzy comes back. Then year later in first grade i was able to join higher level 12year english classes.