I adore my pro. I have only played a handful of games on a premium, but honestly the upper did nothing for me. I had a hard time hitting the catapult, so that was frustrating (play better!...that's on me), and there was nothing else satisfying to do up there. I found myself getting distracted by / obsessed with getting catapult multi going and not paying enough attention to the modes and the rest of the game.
Also, the ramp to backhand shield lock shot on the pro is now one of my all time favorite shot/combos. You can do that after draining from the upper on the prem, but it's not the same as from a buttery smooth ramp. Sooooo good.
I definitely admit I need more time on the premium, and I reserve the right to change my mind, but the pro has quickly become one of my favorite machines ever. Such an intense battle...pure adrenaline. I love everything about it.