I've played all 4.
Star trek premium is gorgeous to look at however the gameplay is identical to the pro and personally I feel that the pro has better flow and cabinet artwork but if money is no object premium all the way.
Onto walking dead the pro is a more difficult game due to the lack of walker bomb which I feel creates more tension and gives the player a more rewarding experience also the pro has better flow (no crossbow, no extra bash toy on the bicycle girl ramp , the bicycle girl ramp is not as steep which means hitting it is easier), the only thing I miss on the premium is the lightshow and the second magnet for well walker thats it which I don't think its worth the extra £2k.

If I were you go both pros and save the cash for another game because 3 pins is always better than 2 or go star trek premium and walking dead pro

Its even better with the vengence light ring mod, movie score soundtrack code and a shaker motor. If only I can get a hold of TWD it seems no one is selling them used here and I don't want to shill out £6k ($7789) for a nib pro. First world problems