UK and international university league tables are published annually by well-established newspapers and other organisations. They can provide a useful comparison between institutions.
However, be aware that league tables use a range of different methodologies, components and weightings and therefore, your assessment of institutions should go further than league table results alone.
Before making your choice of University, if you are an applicant, or a potential member of staff, do try to visit the university and develop an understanding of the wider services, culture and facilities on offer. Make sure that you choose a university that feels right for you and meets all of your needs.