Flash by a mile. You only have to look at the games that followed, and ironically, Williams didn't develop the layout. Bally did. Look at both Skateball and Fathom. Very similar - especially Skateball. Fathom is an incredible player with in-line targets, and i think the layout is similar.
A properly restored Flash is an incredible "bang for buck" machine and easily Williams best system 4/6 player.
