I think we should work towards rewording the custom one to maybe fit the competition or unattributed close reasons because that's something very particular to our site compared to others. Perhaps: "This question appears to be from an ongoing competition or an external source with no credit to the original author. Good questions for this site are unique with specific answers, that are either your own or from a source that you give the entire credit to." Maybe putting in the "Why are questions off-topic" link in there as well.

That way we can keep using the POB reasoning for puzzles that invite many speculative answers, e.g riddles that lack a uniqueness to prevent 5, 10 or more answers with all of those "Close but not it" responses.

As it stands right now, either of those reasons could be used for essentially the same thing. While I don't actually cast VTC votes, yet, when I do flag things for being opinion based, that's usually what I use, the POB flag.

I think we should work towards rewording the custom one to maybe fit the competition or unattributed close reasons because that's something very particular to our site compared to others. Perhaps: "This question appears to be from an ongoing competition or an external source with no credit to the original author. Good questions for this site are unique with specific answers, that are either your own or from a source that you give the entire credit to." Maybe putting in the "Why are questions off-topic" link in there as well.

That way we can keep using the POB or Too Broad reasons for puzzles that invite many speculative answers, e.g riddles that lack a uniqueness to prevent 5, 10 or more answers with all of those "Close but not it" responses.

As it stands right now, either of those reasons could be used for essentially the same thing. While I don't actually cast VTC votes, yet, when I do flag things for being opinion based, that's usually what I use, the POB flag.