<p>Sp with Listening is harder, IMO, mostly because the speakers vary in accent, speed, gender, and nationality. I think both tests are hard and the curve is non-existant due to native-speakers and true bilingual speakers taking the test and acing it. So you should be pretty sure of your ability before taking either. Take a lot of practice tests and look at more than one prep book because some of them are A LOT easier than others. I could only find one Listening prep test.</p>
<p>I'm going to wait so I can take the with listening test. However, I'm biligual and my school suggested this for me so I'm not sure about your personal situation. W/listening does look better though.</p>