AC 10 or 5 vs Gauss Rifle?

So I got lucky into my current run and got the Highlander 732B right off the bat. I have never really used ballistic weapons too much, being more of an energy and missile guy. Which is the superior mid/long range weapon. The gauss seems like it hits super hard but has that very long reload while the AC 10/5 don’t hit as hard but can hit repeatedly from same range.