A lot of people are very critical of it on here because of the perceived lack of prestige, but isn't necessarily true or helpful. It's generally more common that people being at OU then move to a physical university to get their degree, but the reverse is possible and has been done.
The main considerations are, what do you want to do after you get this degree? This may help inform your decision if you want to e.g. go into research and do a PhD vs immediately look for a graduate job. You may also want to look into Birkbeck, University of London's offerings - they specialise in having part time and evening lecture programmes (and some distance learning), but do have physical departments with research staff which is helpful for doing e.g. dissertations/projects and so on.