Quoted from balselly:
Flow....price....chance to led it to your liking.....no hammer/magnet issues....less stuff to break later down the road. It's the same game, just mechanically simplified.
1. Flow - No difference at all.
2. Price - Premium is more expensive.
3. Chance to LED it to your liking - umm, sure, but that costs more money (which is a counter to your point #2), and you cannot replicate the color changing GI or the dimming, both of which are outstanding on the premium.
4. No hammer / magnet issues - once you replace the board (which Stern does for free) there are virtually no phantom hammer hits. Sure there are times when you don't get the ball sensing on the lock, but you can tweak the settings how you like to reduce the number of hits needed to light the locks, and the effect of the hammer knocking the ball down is outstanding on the new code. As Rarehero says, the "hammer blocks my view" contention lacks merit. No one complains about the ACDC premium crossover ramp, but it blocks your view (to a similar extent) of most shots in the game.
5. Less stuff to break down the road - yeah, I guess. Not sure how that's a positive. That's like saying, this stock version of my Honda Civic is better than the SI version because the SI has air conditioning and a sunroof and they may break down the road.
The pro Metallica is a great game. Very full featured. Full points there. And one could argue that the extras on the premium are not "worth" it (I personally disagree). But to hold that the pro is, in and of itself, better than the premium is dubious.