title_body: Should I use the airtight container, or the opaque container?
upvoted_answer: I value sealed over opaque. Go for the sealed glass. Opaque is not really the goal, but rather in the dark. Keeping the stuff in a dark location, even in a clear container, will be fine.
  
  As far as priorities for storage in general, according to the USA National Coffee Association (and others including Blue Bottle and a lengthy missive from The Atlantic), there are four things that are most important for coffee freshness; that is, minimizing exposure to the following:
  
  
  air
  moisture
  heat
  light
  
  
  ... in that order, according to NCAUSA (first link above). That is, keep it sealed (minimizing airflow and humidity, most important), cool (but not cold/refrigerated), and in the dark (somewhat less important). The best place to do this is in an airtight container in a dark, cool pantry. If kept in a dark place, you don't even need to make the container opaque. Lastly, the "light" factor is the lowest in priority, so "mostly dark" is probably good enough.
  
  I tend to re-use coffee containers for this purpose (I have a bunch of illy cans such as these that work well, are a good size, and have a one-way valve on the bottom). Once you buy the coffee, the tins are "free"!