Bally and Data East good. Williams and Gottlieb bad. Don’t know Stern.
Gottlieb made the best electro magnetic games. I have two of them right here in my living room (Super Score and Surfer). They didn’t transition into the digital age very well though.
I love my machines and wouldn’t think of parting with them for anything.
Stern is the ONLY one still in business.
And I forgot to add: Sega Pinball bought Data East, then Stern bought Sega Pinball. So Stern is really the old Data East.