Document benefits (and drawbacks if any) versus other conda/mamba docker images

[corneliusroemer]

Related to #488, I was asked why I use micromamba-docker over continuum/miniconda3.

I had a diffuse feeling that it was faster, leaner, neater, but nothing to back this up. I could write up a few benefits, see #488 (smaller, more base images, faster), but realized that I don't know the full feature set and there might be many more benefits (and drawbacks).

I think it would be super useful, if you could write a small comparison of micromamba-docker and continuum/miniconda3 (and potentially other conda docker base images that exist). I'm sure you know best! Given your superb performance (see #488) you don't need to exaggerate at all to make micromamba look good. In addition, I would really love to know what you don't do better than miniconda3, are there drawbacks you are aware of?

At first glance, the docs seem maybe harder to grasp: they are high quality but maybe lack entry level, non dockerfile examples.