What city is the right choice?

Hello!
I am currently live with my family in Romania. Next year we want to move in Austria, but I need some advices regarding the choice of the city. Both me and my husband we are taking English classes so we can improve our English.
Therefor we are both engineering we look up the condition in Vienna and Graz. What is your opinion about living condition, work, kindergarten , schools,  public transportation, spending time outdoors in two city that I mentioned.

Maybe you should take Germany lessons as that's the language of the country?

But both Graz and Vienna are great cities. I prefer Graz but that's just me.