Is it good to compare universities in motivation letter for student visa? I'm a computer science student from Iran. I'm applying for student visa to study master in Germany. Germany's embassy requires students to write a motivation letter in visa process. 


  For the summer semester 2016 I have received admission from TU
  Darmstadt, TU Stuttgart and university of Freiburg. Also I have been
  rejected from TU Dresden. For the reason of course contents, I have
  chosen to study in TU Darmstadt.


I have written above paragraph in my motivation letter. Is this considered negative to write such things (compare universities or list my admission results)?
If I were you, I would just write why I want to study at TU Darmstadt. Have a look at their web pages, name a few courses you find interesting and a few professors you'd like to study with. I think that may be sufficient.