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Also keep in mind how COVID will affect halls over the next year. Hopefully things will improve, but precautions will probably still be in place. It may not be as fun a place as it typically has been in the past.
I would suggest to stay in halls at least for first term. If you are able to leave for second term then do that but first term stay in halls. Thats where you will truly get most of your social experience from. Have your apartment as a place to bring your friends every now and then (place where you can host things and stay there for your birthday or something). If you aren't liking halls/have made your friends after first term then you can move out.
I think you will find it hard to feel integrated with the uni life and social scene if you aren't interacting with uni students everyday... just from my experience.
The people in my course who live at home honestly don't have that many uni friends and dont get the full uni experience. Whilst having your own apartment is different from living it at home, you still may have a similar experience.
If you have any doubts about your "abilities" and think you might need that extra help from the Halls element, go for Halls. If you have a paid off, unused apartment in Westminster, I don't imagine rent/money is a very big concern here.