Guitars are odd. They're all different, but also all incredibly similar in principal, so it always takes me by surprise which one of mine ends up sounding the best.
For me at the moment it's hands down my Charvel San Dimas. At practice, every time we change guitars and I change to that one, my tone all of a sudden comes alive. It's got a gnarly, almost strat-like twang in the top end, but without the thinness.
I'd put it down solely to the JB, but I've got one in the bridge of my Jackson DK2m as well, which is almost identical spec, but it just doesn't have that clarity (it does sound aggressive as fuck though).
So the least favourite of my guitars tone-wise at the moment is the Xiphos, and a few weeks ago I thought it sounded amazing!
It's really hard to say. My Les Paul probably. The Schecter C1 is so much more aggressive for high gain (ash bolt-on) but the Les Paul is far more musical to me and I connect with it better. The RG570 shreds and not much else.