John McCoy wrote in
:

Well, as I recall the article (and as I posted above), the
two joints broke in different ways. The M&T, all varieties
including floating, sheared the tenon. The domino (and
dowelmax, etc) all broke the mortised board.

Following up to myself, I found the article on line:

http://paul-flores.com/downloads/Joinery_Failure.pdf

replete with pictures of the failed joints.

I was mistaken in thinking they didn't speculate on the
different failures - it seems they attribute it to the
domino, etc, being shorter than a typical tenon. Which
I guess would depend on exactly what you were trying to
join, but in their test pieces was the case.

John