I personally love the quiet and smooth feel of the Brose motor, but I haven't tried one yet that was especially torquey. Even the 28mph version wasn't all that punchey in performance. The smoothness and quietness are a great system for an easy going rider, I think. I tried a dapu mid-drive a couple times, and I'm not impressed so far. More testing to be done with it but even if it's quiet, I don't like how it rides.
Have you found a drive that's smooth , natural feeling , and quiet , with more torque than Brose ?