Chat use case - Class or Cluster?

[Twin Tails]

Hi all, planning to use OrientDB for storing chat messages and came across this doc entry - http://orientdb.com/docs/2.1/Chat-use-case.html

It suggests using classes for separate chat rooms but I'm using the Studio and don't feel too keen on having (potentially) thousands of classes cluttering the list in the schema tab...

Is there any benefit of using classes over separate clusters instead? (I will still be using a base class due to different types of rooms)