Wiesbaden or Mainz? (Wiesbaden-Mainz)

Hi guys,

I got a job in Wiesbaden and just been there once for the interview. Now, I'm not sure whether I should look for an apartment in Mainz or Wiesbaden? After doing some research, it seems that Mainz is the city to choose when it comes to night life and socializing. Actually, this sounds reasonable considering that Mainz has a lot of students. Maybe someone can give further advice :)...

Cheers,
Karl