I owned the Hot Drive N Boost MK1 before. It's a very transparent OD on one side and a clean boost on the other. A comparison with the JnH to illustrate is that when you switch both on, you get a volume boost, rather than a more saturated distortion sound. I would say its a great OD but crunch never gets close to an MT2. Should be similar for the MK2 and MK3.
One thing also is that it works really well with tube amps, and serves more to complement them than transistor ones.
IMO, the plexitone and/or crush zone should be closer to what you're looking for. Do try them out in person.
On another note, I find the JnH quite good for nice crunch and lead sounds, mainly when both sides are activated. The Hyde side alone is quite rubbish in a way.