Finishing my masters right now, I would say do the same as you did choosing your undergrad but slightly differently. What are the differences between the modules offered? Are you coursework-based or exam-based? For me, I chose both courses that were coursework-based as I can't do an exam to save my life. Do you want to write a dissertation over the summer or an alternative? Some masters courses offer a work-based project instead depending on the course and industry. What is the reputation of the university? National Student Survey results have just come out so this can help steer you with fresh reviews. If you have a budget, will the town/city/campus break your budget? What is the employability rate of this university? Read some reviews of the university too. Some people do just fine attending lectures but having great and industry-leading lecturers was really important to me and having a support system in place. But eventually, this is a really personal choice so I don't think anyone but yourself can recommend the best university to you. Good luck!