Lesson 2.2: what is more common: ReceiveActor, or Untyped Actor with pattern matching?

[JohnCgp]

I'm just starting with Akka and have a question regarding whether to use ReceiveActors or UntypedActors, as I've seen them both used.

My understanding is that, as of C# 7 introducing pattern matching, UntypedActors are favoured. The docs mention "UntypedActor API is recommended for C# 7 users.", and I saw a talk by Aaron Stannard at NDC Sydney 2016 also mentioning (at 27m05s) pattern matching would be the way to go once it arrived.

This lesson does not seem to echo that sentiment though; are there any reasons to prefer ReceiveActor over UntypedActor?

I've searched around to see if there is any consensus, but haven't found anything. Issue #236 also asked the question, but didn't receive any response.