On bass i've used Rats, Ashdown drive, odb3, metal zones, sd-1, muffs among others.
but i use my sansamp now. it gets me the tone i want
consisdering modding the metal zone though, it supposedly sounds ace on bass once modded, and using that as insane drive with the sansamp.
Guitar all ive used is a metal muff (which wasnt mine), metal zone and sd 1. or just the amp..