Yanow writes clearly and his notes are usually pretty good, but I find he's been a bit lazy lately, not providing quite as much detail as one would like (not always identifying soloists, etc). Maybe it depends on how much he's being paid. Plus the style of his liner notes is very predictable. Not a bad thing necessarily, but sometimes it's good to change things up a bit.
I like Morgenstern a lot; he's my favorite. I also enjoy Ira Gitler's ice hockey references.
And I'm going to mention Peter Leitch who has done some fine liner notes for CD's on the Reservoir label.
Now here is a very obscure LP. Apparently sold less than a thousand copies according to producer Ted O'Reilly. But the liner notes a superb, a real model for the genre, written by Org Board member Don Brown.