Hi Jambuds.
BIMM is primarily a music school for students studying music or audio related courses - that is certainly it's reputation and what most people would know the institution for. I am surprised they offer an animation course, but can't really speak to it's quality. Brighton is a busy city but has a great community for young people, lots of things to do and independent shops etc.
UCA is a good arts university but very remote, it is located in a rural village with very few amenities, it may be quite isolating if you are international, or quite a culture shock if you are used to living somewhere busy. Equally can be a good fit for people perhaps more anxious about going to university, or who prefer living somewhere quiet with access to the countryside etc. They generally have smaller class sizes and quite a community vibe. I applied here and went to an open day and interview day.
Teesside is a larger town further north. I visited there for an open day. It is quite urban. I would say it is not a particularly pretty part of the UK if that is part of your motivation for studying internationally (although this is ofc personal opinion!). Has a wide range of general facilities in the town. The university is good for digital creative courses and gets generally good outcomes - I found the quality of the buildings varied a lot - some were very new and well- equipped, others were quite neglected and lacked a lot of modern equipment. Ultimately I personally decided not to apply there but it is pretty well reviewed for digital creative courses - definitely not a bad pick.
Have you considered/heard of Hertfordshire and Bournemouth university? These are some of the best animation universities in the UK and may be a good fit for you. The US also has some very accomplished animation schools and a large animation industry, is there a reason you chose to study abroad?