I loved my z7... up until I got my Halon the z7 was my favorite Mathews bow ever. The z3 is pretty much the z7.
Nobody can answer that question for you. Everybody has their own personal preference when it comes to what kind/type of bow they like. I loved my No Cam HTR when I had it but I sold it to get the new Halon 6. Shoot both and go with what you like the best. Sometimes shooting them blindfolded will help you decide what feels the best to you as well.