Are you able to afford the private student accommodation? If yes, then go for it. Although, if you are in your first year, a university accommodation would be a wiser option; it's cheaper, offers more support, see other university students, get news faster and you adapt quicker. If you don't like it when you in are in your 2nd year, you can switch to a private accommodation, they still treat you like a student, it's just pricier and has stricter rules to follow but they're are better facilities and more privacy, there are also quite a number of students in private accommodation. Uni accommodation doesn't necessarily mean a better social life, as long as you have good flat mates, you'd enjoy your experience in either place. Also, check the location of both places and distance to different things like transport, shops, uni etc. To conclude, just go for what suits you better.