I don't think it's as simple as what is top in polls. The polls I have seen don't rate UAL as top. The Ruskin is often top and The Slade. Newcastle comes out best in The Guardian poll.
Manchester seems good and had great facilities, is quite a big city with a thriving art scene and lots of galleries. Newcastle is a nice small town and the university is well regarded. Both of these are much cheaper places to live than London too. Also there are opportunities to socialise and live with students studying other courses, not just Art.
Apparently the facilities at Chelsea are small and there is no print room or dark room. It has the advantage of being in London where there are lots of opportunities to access galleries and the course focuses on getting students to take part in exhibitions. living costs are are high and also travel costs too as willl need to live away form the centre to be able to afford it. UAL has more of an international reputation but I'm hearing it's not as great as it's cracked up to be.