My first experience with pinball machines was as a kid when I discovered the arcade at St Louis skating rink. I had to stand on a box to play the nickel woodrail game and was immediately hooked/fascinated with them.
Then I played the 60's Gottlieb, Williams and CC games at the swimming pool every chance I got.
I bought my first pinball machine, a 1953 Williams from a friend for $30 to save money but it kept breaking down and my father made me leave it behind when we moved across country from St. Louis, MO to Scottsdale, AZ.
In the 70's I decided to buy another pinball machine in Arizona and bought a Gottlieb Sweet Hearts from an operator who was selling out his games, he also had a 2 player game but I can't remember what it was.
Metrocenter in Phoenix, AZ had an all Bally pinball machine lineup in the 70's and at the time they seemed like the best with Gottlieb/Williams a close second.
You could compare EM manufacturers to baseball when they were making pinball machines, some games were strikeouts, some games were singles, doubles, triples and some were home run hits.
In my opinion Bally hit an out of the park grand slam with the 1972 Fireball. At the time it had the wow factor, great backglass and new features with the zipper flippers, spinning disks etc. I don't think any game has ever been such a big hit as Fireball except maybe Gottlieb Humpty Dumpty?
Bally made some payouts and bingo games in the 40's (I'd love to own a working payout game) A few notable pinball machines in the 50's Balls a Poppin for example, some games in the 60's then the nice 70's games they came out with.
Gottlieb made great games during the 50's to 70's, no doubt about it.
Williams has consistently made good pinball machines from the 40's? to 70's.
CC did make a few notable games like mentioned in this thread.
United mfg. made games with great post war backglasses from 1942 to 1962 before they were bought by Williams.
There were other manufacturers not mentioned here. IPDB shows 713 manufacturers which is a LOT.
I was never an operator. I don't have the experience you guys have but there's some great history being shared here!