I have LoTR, STLE and AC/DC Luci. I will have to go with AC/DC because the rules, speed, and difficulty (can be a drain monster) make it a compelling, energetic and tough game. Most importantly, my 10 year-old son is now walking around singing TNT, Highway to Hell, Warmachine...rather than "What does the Fox say..." or some other crap that passes for music these days.
AC/DC: helping to raise a new generation of rock and roll, pinball-pirates!