I know you said 'between the Hyperdrive and the Blackstar' in terms of gain, but they're both distortions arent they ( i mean that rather than overdrives or fuzzes) The muff is a scooped fuzz, while the Hyperdrive has the potential to be very mid-focused.
check out the archtypal fuzzes and see what suits the tone you want best, then go from there - i've been through enough Muffs and muff clones to know i dont want one or a derivative (although my Tonebender is a kinda derivative i think, but its one i like).
see if you can try (or find bass clips of) a Rat, a Tubescreamer, a FuzzFace etc, then you'll have a better idea of which direction to look. and if you hate them all, then get a Malekko B:assmaster
