We are using both. I love Applica now that I’m getting used to it, but I the jury is still out regarding Arbor. We are a stand alone Sixth Form, and we’ve had a number of bumps in the road with it. I’ve never used SIMS though, so I honestly don’t know how it compares to that, it may well be better. I would do lots of research before making any final decisions. I’m not sure if that helps!