In on vacation and have a little free time. Here's the list of games with a Pro or LE.
Reference page ==> http://www.sternpinball.com/games
Star Wars
Aerosmith
Batman 66
Ghostbusters
Game of Thrones
KISS
WWE
The Walking Dead
Mustang
Star Trek
Avengers
X-Men
AC/DC
Tron
The Rolling Stones
Transformers
Avatar
They played around with the idea of LEs with LOTR, Black Spider Man and the likes. It seems like true playfield changes started with Avatar and was full on by AC/DC. Not all have been hit titles, but Stern has continued to upgrade the overall system (Spike, new cabinets, LCD etc) while sticking with the 3 tier approach.
I think many of the pros are great games. It may be true that some designers make the LE and trim back for the pro and the opposite for others. Despite that, the outcome isn't always predictable. Some of us like more features, others like more cabinet bling. We can be sure as the sun rises that one is better, but our fellow collectors may still disagree. We debate objective differences. We try, but can't effectively argue subjective preferences.
I purchased these:
AS Pro
GB Prem
Mustang Pro
ST LE
AC/DC Prem
Tron LE
Spiderman Red