In my opinion, there's a long anime and short anime for different type of viewer to choose. I mean, there are people who enjoy short anime because they want to venture with different genres and plot once in a while. And there are these people who love to stick with a single franchise and dedicate a huge amount of attention to it, like One Piece and Naruto for instance. For me, I can't decide on what I like more. Maybe it only depends on my available time and mood. I have an ever changing time schedule so it makes sense. I love the both of them.
Definitely, they different.