I dont know which offer to accept (Physics)

I think it is very sensible having your firm being somewhere that feels right.When it comes to the content of the courses, especially for the hard sciences, the topics covered and difficulty will be essentially the same. 90% of the content will be the same for Physics anywhere you go, the last 10% of content is ususally guided by the lecturer research. The difference in your two offers that you have mentioned are 2 grades, I would be inclined to say that this difference is negligible compared to how happy you would be at a particular university.I think the most useful thing to consider if picturing yourself spending the next 3-4 years in and around the facilities where you will spend the majority of your time. May seem obvious but this is what helped me make my decision.

Thanks for your input, I do think going with your gut is 9 times out of 10 the best way to go. I'm just deciding whether york's campus is that much better enough to justify the difference in graduate prospects. If there even is that much of a difference. Do postgraduate courses care much about what uni you came from??
Out of interest what was your choice in the end? Where did you go for what?

Well one of my professors did her undergraduate at Reading before moving to Imperial for PhD so York isn't going to 'rule you out' or anything like that.
Of course when it comes to PhDs what matters much more is whether there's a supervisor at the uni offering a project you're interested in.

Do you think I should pay special attention to the department's research interest if i'm gonna do an integreated masters or will it not matter much until postgraduate?

There will always be projects from a wide variety of fields; perhaps some more from one area than others if the department has a particular focus. But you're almost certainly going to change your mind or plans in the next three years anyway so I wouldn't make it a deciding factor before you even start. My personal statement might have been all black holes and Standard Model and dark matter but now I'm more into environmental physics.

Thanks for your input, I do think going with your gut is 9 times out of 10 the best way to go. I'm just deciding whether york's campus is that much better enough to justify the difference in graduate prospects. If there even is that much of a difference. Do postgraduate courses care much about what uni you came from??
Out of interest what was your choice in the end? Where did you go for what?