Own and love both! TSPP definitely holds up over the years in satisfaction and depth. I can't imagine ever selling that. As I get better it does as well.
FG is hysterical, so many callouts they really did an outstanding job with that. I agree with that point earlier, best callouts in pinball. Years later I still hear something new that cracks me up. Animations are also really fun, and Stewie pinball arguably best toy in pinball, certainly best mini playfield.
Hard to go wrong. Immediate gratification with FG, long term love-fest with TSPP.