That is a GREAT question, thanks for pointing it out. Let me flag someone down to see what the difference is and at a minimum to add an "other" category. I'll get back to you.
"other" should now appear as an option
As for the difference, it's more detailed than the Type of Case to drill into what issue prompted the case so we have a better understanding of the situation.
If you or anyone else have more feedback on this new field, please comment here!