When I was choosing a puppy I wanted both those breeds too. They both will require a lot of work, exercise and care. With regards to coats they both will shed. I find that if you do a 10min brush each day that they should be pretty good.
The only problem you will have is with school. When I got my first GSD I was in high school so I was away all day and had study and home work to do in the afternoon. Luckily my mum went out during the day to play with her.
If you have a family member or a friend that could come over to play with her when you are away or busy that would be a great help.
Otherwise good luck!