I believe the Toro is a clone of the Moog Minitaur or a straight copy of the Taurus. I don't have direct experience with the Toro but my guess is that it will be reproduce the sound of the original well (based on how they did a great job with the model D) and that's a great synth bass sound.
So if you want a synth sound and don't mind always bringing your keyboard and Toro, that will most likely be the best sound. If you want to always have the possibility of using a synth like sound in your pedalboard, then the MXR may be best
As usual the answer is... get both