As others have said -- all are really good and fast playing games, but have different types rules. Do you like to gamble big scoring opportunities and classic rock? ACDC Pre. Do you like speed, flow, sound, third flipper, and Sci Fi? Tron. Do you like metal music and some grind before the game starts to come together? Met.
One thing no one mentioned was price. I don't know the market in France, but in the US, the games are approx (for stock): $4500 (Met), $5200 (Tron), and $6500 (ACDC).
My preference is Tron > Met > ACDC Pre. But, I have played all three extensively and Tron is the one that I *just like* more. However, I understand why other people like the other games more.