I would have to show 2 machines that are polarities apart.
DMD would be one of course as its how pinball ended up and for this id choose either TAF or CV
But then to show another that in all honesty is way way different and for that id choose something like NASCO BING BANGO from 1951. A conversion game and a great player with vastly differing artwork and reverse flippers. One of my favourite machines in my collection