If your collection is big enough and you want amateur players to have fun IJ4 is the king imo. Non Pinball people flock to the my IJ4. If you are just playing by yourself most of the time, the Williams is probably better. If you want one your wife may also like, IJ4 hands down. My sister will come over and play IJ4 for hours straight, ignoring the other 20 games in my basement. If I have experienced players over, then it is just on because the others are on. I am obsessed with TWD atm so when playing alone, it is the star!