Quoted from Pecos:

If reliability, ease of restoration and easy to fix are at the top of your list, then I agree with zacaj. Williams used a lot of relays with longer switch blades that are easier to clean and adjust and stay adjusted over time. All of the relays are easy to get to and they don’t use regular slotted screws that one manufacturer used. The Williams EMs I have on route that have been properly restored are very reliable.
Williams had some great games in the 70s. They were the first to use DC powered slingshots and pop bumpers beginning in 1972. Their pinballs are the fastest of the Big Three.
Look at:
OXO, Space Odyssey/ Space Mission, Grand Prix, Aztec, Fan-TasTic, Spanish Eyes, Expo, Doodle Bug (novelty), or some of the 1976-1977 pins like Rancho, Big Deal or Argosy.
If you’ve gotta have lots of drop targets, then you would want to go with Gottlieb:
Joker Poker, El Dorado, King Pin, Jack in the Box (similar to King Pin but with a better art package), 2001, Royal Flush and a lot of other card-themed games with drop targets.
If you are looking for iconic games then you have to go with Bally.
Wizard!, Captain Fantastic and the Brown Dirt Cowboy, Old Chicago, Bow and Arrow and Aladdin’s Castle. Too bad you don’t like 2” flippers. Some of Bally’s best pins were 2” mini-flipper games like Fireball, Nip-It, 4 Million B.C and Capersville.

Quoted from o-din:

Williams don't need no stinking high tap or hot dot coils.

Quoted from o-din:

Williams are the easiest to work on and play fast and it wouldn't be too hard to come up with four including a Grand Prix as that seems to be a very popular one with modern pinball players.

Quoted from o-din:

No love for Chicago Coin?

Quoted from mbaumle:

I disagree. CCM games are pretty terrible. The cam that holds the score motor disk is weak and often breaks, and the relay stacks are all made from cardboard that warps over time, and the score reels use a wiper disk plate for the 0-9 position switches. Couple that with oddball parts for drop targets, flippers, connectors (they use a molex style, not a jones plug style), and lackluster gameplay, I have a really hard time recommending Chicago Coin games to people. They just don't seem well built to me.