I may seem biased because I own a DE simpsons, but I also live 15-20 min from a Popeye on route (ironically which is 2 machines down from another DE simpsons).

Popeye would be the absolute go-to if it weren't for the horrible visibility of the lower PF. It's not about needing to see where your shot is going, it's about your ball coming back and being able to react appropriately.

Having said that, simpsons may sound like a "one trick pony" with the ramp, but in reality the main objective for massive scores is getting to 3-ball multiball which first requires hitting 3 centrally-located drops (SDTM risk) and then locking for multiball... and then in turn locking both of those. If you can get this (approximately 5% of games I play) then in 3-ball you still have to hit the drops and then hit the ramp for a sliding jackpot. It's an insanely tough objective to have all those stars align. It's not a deep game, but for 1-2 main objectives in the game, damnit the jackpot is one that requires mastering the entire machine to do. That alone is enough to make simpsons have replay-ability.

If you can get past the upper playfield acting as a giant blinder for most of the game (and the fact that once your timing is good, the skill shot is as hard as stopping your gas pump within $0.25 of what you want to pay), Popeye is a much deeper game with a lot to do. But if the upper playfield makes the game unenjoyable, simpsons >>> BTTF. My $0.02.