Which pedal is better for the maximum power of distortion, a Metal Muff or MXR Fullbore metal pedal?

i just want to know which pedal is good for maximum distortion for bands like As I Lay Dying and stuff like that so if someone can help me that would b good. So if any of you know which of these two is the best cool but if you know another pedal that is better than these, great i would appreciate it.