A problem from two different 7x7 Go investigations.
Please high ranking Go players tell me (12 kyu) what is best.
If Black simply descends, White gains a point with . So I'm inclined to vote for the throw-in.
lightvector: Edit from years later in the future! (2021)
KataGo suggests that the throw-in may be actually completely unplayable for black, because white has this placement to cause trouble next. The immediate threat is the cut at "a", Black must defend it somehow.
I have not analyzed the variations, but this way for example black is coming under liberty issues while white threatens to live in the corner.