so if you chose one, which one would it be?
It depends. I'm maybe a bit more concerned about scratches and stuff than the average person, and my wife is not always gentle with her computers, so I think I'm going to have her use the hardshell.
Also, she will be riding the metro to school with a backpack full of heavy books and crap. If she were driving to school and carrying a lighter load, I might lean more toward the sleeve.