The B/W (honestly Bally and Williams were the same pin company in the 90s) games from the 90s are creative and did some wonderful things with code. It was an evolution of the great playing early SS games that were admittedly light on code.
The early 00s Sterns were a step back. Struggling to stay relevant, Stern gave up on code on some of their games to push out the next game. That created games that feel unfinished.
Newer Sterns are really great but you still need to wait a few years after release to ensure that code gets some polish. Code is where Stern has jumped ahead of B/W DMDs. The depth is really amazing. They still put out a dud once or twice a year but that was the deal with B/W in the 90s.
Stern has never really done anything amazing with their playfields. It's a lot of the same old stuff. A bash toy or two, a couple of ramps, two flippers, an Italian bottom but the code is what really elevates their games a lot of times. When they did veer away from standard layouts it wasn't popular (WWE).
With regard to flippers, I personally like all flippers of every era. EMs, SSs, DMDs. All I want from a flipper is to be able to make the shots I'm supposed to be able to hit. Nothing's more frustrating to not be able to hit a ramp because there's not enough power in the flipper or make a target because the geometry's off. The only flippers I thought were a little different were P3s but it wasn't because of playability.