I have my share of nice Stern pins, and I think Met pro is the best when I consider price.
Tron (about equal gameplay) but I put a lot of money into Tron lighted ramps, arcade mode, LEDs are a must.
IMVE (about the same cost) but likely Met is a tiny bit better mainly because it's code is just a bit more to do.
STLE (lots more money)
AcDc premium (lost more money)
XMLE (more money not as good)
I don't have a lot of time on Met premium, a friend has one and had maddening issues with the hammer/lock mechanism. I am not really 'missing' any features because to me the Met pro is perfectly simple. I guess I'd rater have spinners (but I have IMVE which has 3 spinners so that's making up for what Met pro doesn't have).