I have all 3 and my personal recommendation would be SM, IM Tron. All are very good, but if you can only have one, given the theme, flow, and numerous modes, SM would be a hit with most guests and non pinheads as well. If you are somewhat accomplished in your flipping skills then IM really has a great " one more game" quality, but can be brutal and frustrating to guests, Tron is good as well, but it doesn't hold my attention like the others, but is the a beautiful game. Spend some time on all and see what fits your need the best. Good luck.