Bally and William's games are much easier to adjust and once dialed in stay that way. Gottlieb games with those AG relays are a PITA. Extremely small throw, hard to adjust and dial in.
Decagon reels are an example of just because you can doesn't mean you should. Overly complex design compared to Bally and Williams. I guess in their favor they're better than rat traps.
Bally and Williams score motors are easier to see and adjust. In Gottlieb's favor is that their motors cycle 120 degrees vs the other two 180 degrees which makes Gottliebs a bit more responsive.
Bally and Williams went to DC power before Gottlieb making their games faster. In general I think Gottlieb games have more features although not always.
I like all three. But for ease of service Williams and Bally are better.