As for comparisons, I can say performance between the two is close under ideal conditions. When it comes to wind, the Caldera will win out most times, especially with users not willing to fuss with supervision. Ultimately the bigger decision between the two, seems to come down to preference. I've been using Calderas exclusively for two years, and love them, but when it comes to packing my Amp, the Microtus is my choice.
You said it the best, top burners for mugs.