Ok, what would be better, a Boss ME-20 or Digitech RP500? Is the RP500 worth the extra $100?

Yes I already searched.

What would be better for distortion? like slipknot etc.

I noticed the boss only seems to have like a "metal" setting and you can adjust it a little bit while the rp500 has a bunch of amp models and pedals..... would that sound better than the boss?

Thanks for helping me out.
anybody have any ideas?

(sorry if thread bumping isn't allowed, i looked around and didn't see anything about it)
What's your amp?
Call me Wes.
Fender American Deluxe HSS Strat
Chicago Blues Box Roadhouse
Bad Cat Cougar 5
1957 Gibson GA-5
Ceriatone 18w TMB Combo
Hughes & Kettner Tube Factor
Various Ibanez TS9s
Weber MASS Attenuator
well right now its a frontman 15........ but i should be getting a blackheart or valveking fairly soon i hope......... whenever that economic stimulus package comes out