I've played damn near every game ever made it seems (I live by a massive pinball arcade).
Now, years later... I prefer Stern? Weird!
I can't believe it but its true.
The obvious moment of clarity for me was during an 8 hour tourney. When a Stern game was up I reeeeally enjoyed the tournament. When a WMS came up I still had fun but yearned for the next Stern title on our list.
There are exceptions. TZ, IJ, STTNG, AFM & MM. Other than that I'd rather play most of the Sterns.