I've owned both of these now, both awesome
premium t rex is better than I realized. It does indeed add an extra shot in the sense that you need a better more accurate shot to activate t rex modes. It sort of has the same effect as the hyperloop ramp shot in star wars.
the premium raptor pit is better because its easier to start raptor tri ball and the actual mode is more fun with the captured raptor. However, I do think that the shot returning to the flipper via the control room on the pro is a better shot for general gameplay when not in a raptor mode. So its kind of a wash for me
art, I personally still like the pro art better but they are both underrated and very good. you cant go wrong
overall both are amazing games. I don't believe you can stay you like JP premium and dislike the pro, if that makes sense. They play quite similar. Id say that if this is a true long term keeper for you the premium is worth it. Otherwise the pro gives you a lot of bang for your buck.