These are both music themes and one thing a lot of people are overlooking is the sound system. The Stern SPIKE system sounds better than JJP. The CE does add a sound bar to the top and I haven't heard one yet. Sterns have three channel 2.1 sound and full range speaker directed at the player instead of pointing upward in the backbox. It simply sounds better, fuller and richer. Playing GnR LE and Avengers Premium side by side in a quiet room the difference is undeniable. This makes a big difference to me. I have a Beatles that is on loan in my game room and it sounds fantastic without even connecting the external sub. The Stern LEs get upgraded speakers and amp too.
So it comes down to what most of use knew would be the case. Basically JJP games look better, packed playfield and weigh more and Stern games have better shots and are more fun to play. JJP had Slash support and help which is awesome because they had a lot more leeway on both artwork a depth of license. Stern was handed a pre-selected bunch of artwork from which to chose and not to deviate. GnR looks like a world under glass with fancy guitar necks and drum sticks everywhere, but after playing many games the shots were just not really satisfying shots IMHO. LZ Premium and LE playfields are more open and fast looking with some awesome looking new ramp designs, SR upper flipper ramp a cool spinner toy. It is not for everyone, but obviously more of a player's game than GnR. It is not hard to see some Keith Elwin influence in this new Ritchie playfield design.
GnR is the best JJP game yet with an amazing looking playfield, but a theme that I can't put out money for other than location. Good for everyone who has one and enjoys it. To me this choice has always been a no brainer because I don't like GnR aside from maybe three songs. LZ is an all time favorite for me and I also much prefer the Steve Ritchie designs and the Stern platform and sound system. Value is in the eye of the beholder when it comes to pinball. I value fun and dream theme much more than I do a few extra coils or some drum sticks and mods that I can surely add later if I want. LZLE is still on order and I can't wait to get it!