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It might help to know which country you're a citizen of. For example, having to deal with visa issues or adjusting to an unfamiliar culture could be a distraction from your PhD work. Also, trying to finish up a PhD while interviewing for jobs in a different country might be stressful.

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Ah of course, I'm a US citizen! I went to UCSD for undergrad, and am attending Harvard and Georgia Tech for my master's

You posted this clarification while I was writing my response.

Based on the additional information, I would suggest that a USA PhD research op would present more advantages.

Notwithstanding that, if you are attracted to the adventure of studying at Oxford and are able to secure a well-funded research position then it could be a fantastic experience.

My apologies, and thank you, your advice makes a lot of sense!

Be aware that the UK is currently planning to leave the European Union, where a lot of high quality funding for projects is coming from. The next few years are a little bit unclear in that regard.

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