I would think Mark IV would do more than Mark I, especially in the high gain arena. But, Mark I's uniqueness is its Ch. 2 which is the "original" boogie voice which I just love, especially with a Strat. Plus, with my Keeley modified Dist. 1 and Blues Driver the Mark I is very versatile!!! I love this little amp, and it's also very powerful (100/60) and cuts through the mix like a hot knife through butter.