If you are talking about learning the airplane, the Metro is easier to learn. If you are talking about flying an airplane, the SAAB is easier to fly.
I'd keep this in mind, heavy airplanes look better to some employers, but then again so does single pilot flying. However, turboprop PIC time is the thing to get. So, if you are talking left seat of a Metro or right seat in a Saab, take the metro. In fact, take the aircraft that gets you to the left seat the quickest. If you are going straight into the left seat of the Saab than take it.
Confused enough?