Hi Scott,
It may be hard to answer this question without a little more background information on what your end goal is here. Subtypes allow you to categorize features within a feature class that share the same attributes. For a given subtype, you could have either a range or coded value domain associated with it.
For example, I could have a subtype of my Water Lines feature class called Copper. For a copper line, I could have a range domain that specifies the pressure allowed in that line, say 20-30 PSI or something. You get the idea.
In this case, it depends on how you want people to work with this data? Subtypes and domains are great for workflows that involve heavy editing by many editors in order to cut down on data entry errors. Is that something that will happen in your case? Given the screen shot you attached, I could see something like a Facilities feature class with a field called Facility Contact. Facility Contact would be the subtype and maybe a coded value domain is put in place listing out the 5 types of facility contacts. You'd have to play around with it to see what works best.
More information on subtypes and domains here: Introduction to subtypes—Geodatabases | ArcGIS Desktop
Hope this helps and let me know if you have any questions for me.
Jonathan