have got to vs. have to & gotta

[Take_It_Easy]

I would be so curious to know, native English speakers, which one prefer to use among the below mentioned phrases:

I have to go to work

I've got to go to work

I gotta go to work

I know all of these have the same meaning, however I dont like to use the second one, which is very british, and I consider this is unnecessary to put "got" in the sentence. I live and work in the UK, but I've noticed that here is more common to use the second one. Would it be weird if I prefer to use the third one here in the UK?

[Mister Micawber]

The third one is merely a transcription of how many native speakers pronounce the second one. You may do so if you wish, but on a non-native speaker it usually sounds weird. I don't find #2 particularly BrE; it is also common in AmE, as is #1.
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Native English teacher at Mister Micawber's

[Take_It_Easy]

I've learnt English since Primary School, but I hadn't heard about the #2 before I came to the UK. Strange..