I played a Petrucci for a little while on a line 6 amp, and already I can pick out the sound that is in Petrucci's tone. I can't judge the Luke, considering I haven't picked one up yet, but really it is all about what you listen to and what you play. If you want Prog. rock / metal, with tons of shred solos, I would get the Petrucci. The Luke I would picture for Classic Rock? But listening to Wells band, he put some heavy stuff in there. IDK, its up to you.