This isn't half a strange question.
The real one you need to think of is where you are from and where you have the right to work. That should determine what licence you get, not the perceived recognition or cost of getting one.
If you are a British citizen (Oxford), your best choice is to get a UK CAA licence. If you have the right to work in the US, say a green card, then getting an FAA licence would be a reasonable proposition (better job market - but you do have to get those 1500 hours). The tough choice to make is if you have the right to work in the UK and EU. My personal choice in that case would be to go EASA, but others probably have the opposite idea.