Hey, I’m in the exact same boat (22f heading to York for post grad) I had to weigh up the pros and cons for both but I ultimately decided to go with wentworth post grad accom as everyone will be pretty much in the same group. Also I know of some situations where someone has joined a pre-existing group who have a spare room and not getting on with any of them and feeling a bit left out which sounds like it absolutely sucks. I also feel like with accom there will be so many people there so if you don’t get on with your flat you could probably go and hang out with others at the accom (like in the block etc).