I’ve owned Shadow, played AFM hundreds of times, and I’ve had my STH Pro for about 6 months. Here’s my take on just the layout, leaving code aside.
AFM has the most satisfying ramp and orbit shots. They’re very similar on STH, but a bit tighter, so it takes a little more skill to hit the right ramp and left orbit. Hitting the scoop on AFM is more satisfying than the mystery shot on STH.
STH has a very satisfying inner loop shot, Burn It Back, that can be shot from either flipper. The left orbit, while tougher than on AFM, is incredibly satisfying since you get the spinner sounds and the ball feeds to the right flipper so you can hit it repeatedly. The center section of STH - 4 drop targets, 2 stationary targets and the Demogorgon - absolutely destroys AFM’s stationary targets and saucer.
Let’s talk about Shadow. The ramps with the Phurba diverters are cool, and the lock shot is awesome. But playing Breakout with the flipper buttons is the least amount of fun I’ve had playing pinball. Overall I’d rank Shadow at the bottom of Eddy’s efforts, but the callouts are what made me sell it after 4 months.