It really depends on what you want. I would suggest doing some of your own research and you can read student reviews about each uni. I would say personally when i was choosing what uni to apply to i chose portsmouth over swansea because i disliked how swansea was so far away from everything and how you have to walk a distance to get even to your lectures or to go the city. Portsmouth is more 'city like' (if that makes sense aha) and i believe has quite a good night life a good balance. Academically at least for my subject, portsmouth is better and i have heard about people complaining about the teaching standards at swansea. It really depends. Looking at photos of the places and the unis and trying to envision myself being there is what helped me to choose where to apply to. And also look at stuff that matters to you for example, bursaries available or what their mental health team are like.