I was in this position last year and went for the lower one, even though I got the grades to go to the higher one. My reasons were because it actually offered the specific course I wanted whereas the other one didn't, I felt more at home and welcome at the lower one and I could see myself studying there. I am very happy here and doubt I would have been at the other uni. I'm still determined to get a great degree even though my uni may not be highly ranked. It is best for me.