Thank you to those that have given the advice. They are much appreciated.

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Hi, I'm new to this forum, so not too sure how to start things. And no for some reason I didn't use this forum whilst I was searching for a PhD. I'm going to start my PhD position at Bristol in September in a topic I'm very interested in. However, recently I got adviced by some friends who are doing PhD in the US that PhD in the US is regarded much higher than in the UK and it will be difficult for me to get a job in the US with a UK PhD. Just wondering if that is the case or not. If true, are there anythings I can do to raise my employability abroad after I finish my PhD?

I'm not going to reject the PhD position from Bristol, as it took me ages to get it and there is very little chance for me to get a studentship in the US at this point for September. But I know that my lab will send me to Boston to create a mice model with the a group in Harvard University for a collaboration project, will this make my CV look better?

Sorry in advance, I'm very confused as to what the real differences between a US and UK PhD are. And thanks for any advice people.