You're probably going to get an overwhelming response in favor of keeping The Shadow.

JunkYard is pretty cool but I feel like it's a one trick pony. I always feel like I'm shooting for that center shot behind the wrecking ball. Sure there are other ramp shots and such but the flow of the game and the speed really lends itself to slapping the ball right back up the middle. Multi-ball starts here as well as Jackpots and most of the rewarding shots on this game are straight up the gut shots all day long. So it does get kind of boring in that aspect. I'm sure you could break this one down and get into more of the modes and goals of the game but the whole play style and flow seems to be centralized around the wrecking ball bash toy. If you hate games with bash toys you might not care for JunkYard.

Looks like you have owned your fair share of machines and I was going to suggest BSD but it looks like you already have one. Not sure what else might fit the bill, Indy 500? I think you'd be done with JY after a few months or years maybe considering you like the more challenging games....