If you can afford the single apartment, go for it. In my experience, roommates have been nothing but annoying because they don't understand what it means to have to study for classes.
It totally depends on what type of person you are and what kind of roommate you can find. I know some people that are perfectly happy living by themselves but I'd probably go stir crazy if I lived in a studio apartment by myself. That said 2 bed and 2 bath is definitely clutch. That way you get your own space that you can keep as clean or as messy as you like.Personally, I would get a single if it was within your budget. I don't think I could survive with a roommate unless I had a 2 bed/2 bath.
How big is the studio vs how big is the 2 bedroom apartment? Do you already know your roommate or do you need to find one?I am attending medical school and I am deciding between leasing a single apartment versus a 2 bedroom with another roommate. What do you prefer?