I have played all three. I think GZ is the most fun, but I have considerably less time on Oktoberfest but I love the theme.
I have a GZ premium on order knowing it would be several months before I received it (played an LE on location enough that I decided to order a premium). I came across a NIB pro and picked it up despite never playing the pro thinking I’ll just play it until my premium arrives and then trade it for another pin. GZ pro is fantastic and does not feel incomplete at all to me. You don’t get the cool toys, but it does not change the gameplay that much for me. Yes the plastics are flat, but whatever. I’m more of a premium guy, but at this point I’m still not sure what I am going to do when the premium shows up. I may sell the premium and keep the pro.
My son says he feels like it shoots easier than the premium FWIW