Williams late 60's single player.
Gottlieb 70's to end of EM Era any player configuration.
Young young children any machine will do.
Young children like single-players, their "Own" machine.
Pre-Teens like 2-player machines, a meet and greet without the threat of others horning in.
Men like 2- players as well, get back to the action without too much pause as the adrenalin rises with higher scores.
Women prefer 4-players, couple against couple.
Good luck with your endeavor!