These two questions are very easy to answer. The answer to the first question is "disc one" (the funeral march music). The answer to the second is "I skipped disc one".
I haven't gone back to the first CD yet give it another chance, although I've listened to the other three numerous times. The first one just left me cold. Seemed stiff and unengaging. The rest of the set is just great stuff. As for what to compare it to, I don't know. Is it hot jazz like Bix? Well, it's hot jazz, but I never thought of Bix as hot jazz, so we're probably using the term differently. Unfortunately, I can't compare it to the HRS set as I don't have it yet, but from the looks of the catalog write up, probably. I guess it reminds me of dixieland revival stuff except by people who "get it" as a living art rather than a museum piece, if that makes sense. Like you, I really enjoy checking out the history of the genre, and this set opened the door on an area that I've really neglected.
There is one date that you should always keep in mind when asking my opinion on jazz: January 1999. That was the point when I ceased to be a "dabbler" (with probably fifteen or less jazz CDs/LPs) and fell into the abyss. In other words, I haven't been into jazz that long, and taking anything I say as an "expert opinion" would be like asking the gang on our political forum who's going to win the next election: you'll get a lot of longwinded opinion, but whether it's worth anything or not is anybody's guess...