I have had months with both of these machines. NGG is like a fishtales type of experience. Fast quick and frustrating when things aren't going your way. WPT is a target shooting game with a slower pace. Deeper rules and imho has more lasting power. I think your decision is do you want a fast quick game that leaves you wanted more? Or do you want a deeper game that you figure out ways to score points with low risk over time. It's a personal decision. Also experience on maintenance with Stern or Williams would influence my decision. I am comfortable working on sterns and much less with Williams. GL either way they're both great games.