to me ESP has a certain sound, kind of a smooth mid range sound, which is cool if you want your guitar sound like the guys from inflames(smoothing sounding.)
I'd prefer a jackson, because the guitar has a lot of soul, maby it's just because i like old school metal.
But for modern metal i'd say an ESP would do the job, but then again so does Jackson and Dean guitars.....
P.S: Has anyone ever had a spin on the "Dean from Hell", probably the most comfortable metal guitar i have ever played on!!!
Here is a pic:
http://ggames.files.wordpress.com/2008/11/dean_from_hell_cfh_enlarged.jpg