Hello sI,"your correct choice is subjective....I gigged the mxr for a year or so before buying the proton... Why? I was asked to create the herbie Hancock. Cameleon sound's which the mxr cannot do!!!! It quacks & doesn't d'wop's... You cannot shift the filter up & down. So I tried the proton & it's so much more versatile & better sounding.....I.M.O