Where to buy

Hello,

I have a question and I'm not sure if this forum is the right place. Anyway, I'm in UK now and I want to buy an iPhone 6s, since my 5s is very slow now and the battery doesn't last very long. My question is if I should buy the iPhone in UK or saint until next week where I'll be in Abu Dhabi. Where will the iPhone be cheaper? Or is it about the same?

Any help would be greatly appreciated.

Thanks,