I've had both and sold both. The Duality is an awesome fuzz pedal - 'Hysteria' in a box(!) - but that's all it does, it is not an overdrive. The Aftershock provided lots of programming fun, with dual / combining channels etc but in the end it is a digital device and sounds like it.
For my money, nothing comes close to the Darkglass pedals for controllable, natural-sounding overdrive. I mostly use a B7K with a P-Bass and it never fails to deliver, bringing focus and definition that gives my bass its own space in a noisy twin guitar rock band. They're expensive but good stuff always is.