I have quite a few EM's and I go in streaks as to what I find myself playing. Play favorites do change back and forth !
Newest additions of course get more play when they are added to the collection. Some of my favorite games though if I had to make a list are Ship Ahoy, Flip Flop, Little Chief, Boomerang,Bow and Arrow, Mustang , Top Score.
Guests like them all and some go to my High Score Boards (two chalkboards with all the games listed with current high scores) and try to get there name up there by playing a machine with what appears to be a lower high score or beatable number.
I think the guests like Flip Flop, Gulfstream, Sure Shot, Top Score, Ship Ahoy and Mustang and some others when they first come in and look for a machine to play.
Guests if they have time want to try most of the games. If they do well on one on the first try they will play a few games on that machine and then go to another game somewhere near it in line. Appeal to personal preference in backglass theme or art draws people in to what they try of course.