Dear god. You're all so high. Loomis Petrucci and Romeo have three entirely different playing styles. Romeo tends to overemphasize legato string skipping and tapping with the occasional sweep-fest, petrucci is alternate-picking centric but has recently revisited some sweeps/tapping in DT's recent shred-themed album (it's one album, the next one'll be different, I'm so sick of this "lately blahblah" crap) and Loomis...well he plays dimished stuff all the goddamn time, but he is very good at it and usually makes it very interesting.
Petrucci wins on melody. WINS. And no I'm not talking about Train of Thought solos. But other than that it's really tough to say so and so is better than so and so 'cause all three of them are really quite insane. But frankly other than the obvious hypocritical statement I just made, I think claiming anyone would own anyone else out of those guys is pretty ridiculous.
I haven't heard some of those other guys but I do agree on Michael Angelo and Rusty Cooley on being able to play 1 million of the most boring notes per minute. I told one of my guitar students the other day I don't listen to Rusty 'cause all he does is play faster than the human ear can decipher, occasionally playing a few really slow over-vibrato'd notes to be like "oh, now I'm playing melodically and emotionally, ok back to shredding" and he said "But that's kind of what Yngwie does" DING, DING! Tell him what he's won! (the kid is a big fan of Yngwie, and no I don't think Yngwie is quite that boring, it's just an exaggeration of Yngwie's predictable pattern)