What are the difference between CCM2 and CMMMicro?

What are the difference between CCM2 and CMMMicro?
Which is the better?

We are installing our first Micro on Monday. Biggest difference: size. The Micro is more compact, but here’s the kicker: the 24VDC is in a NON-weatherproof, external unit… which means you not only have to find a place to mount the micro, you must also find a place to mount this power supply. As it turns out, the place where we’ll be mounting our Micro is inside, but if it weren’t for that, I wouldn’t recommend the Micro… spring for the extra cost of the CMM2. Just my opinion.