UAM or URJC for Erasmus in Madrid?

Hi everyone, I'm planning to go on Erasmus in Spain, specifically in Madrid. I have narrowed down my –already very limited– choices between Universidad Autonoma de Madrid and Universidad Rey Juan Carlos. Which one do you guys think I should choose? As for courses both have exams I can take so that is not an issue. Something that worries me is where they're located: I see that both are pretty far from the city centre, one north one south (fuenlabrada campus). Which of them is more accessible and easily reachable through transport? Also, would it be better to live close to uni or commute from the center? (I'm leaning towards the latter tbh but still not sure)

thanks in advance!