What is the best distortion pedal for heavy/death metal..

I think Boss Mt-2 , Line 6 Über Metal and Mxr Double Shot are good..

What are your opinions?
I have a BOSS MT-2, you can dial some pretty good tones for thrash and power metal and if you crank it up all the way you can get some good death metal "Children of Bodom" style tones. The crunch is really good and clean and there's virtually no feedback. It's a great pedal...a bit pricey. I don't know about the other 2.
Ibanez Prestige RG1570 ftw!
i had the boss mt-2 for a day.

it had major feedback.

It didn't impress me, but I haven't tried many distortion pedals.
I have the boss MD-2...i personally think its a very nice pedal...i meant to get MT-2 but asked the guy at the counter the wrong 1... but in retrospect...Im glad i got the MD-2...i also use a NS-2 noise suppresser...it works amazingly.