Security of Zeppelin vs. Hunter's bends

Would someone be able to comment on the security of Hunter’s vs. Zeppelin bends when slack? The word on the streets is that Zeppelin is less prone to jamming (I understand based on one comparison done on tiny cord - is that true?). But how about their propensity for getting undone when slack (e.g. when used for making prusik loops)?

Making of round slings, often to be tied once,
used as such ever after, is better done with the
grapevine. (Double harness bend & blood knot
could serve, too, I think.)

You can try some of your own testing for slack-security
(w/various methods --some might be good to involve
some incidental bumping into surfaces, which action
can push a tail inwards and so loosen).

[i]Thrun’s joint /i will likely show itself
superior to many other knots in slack-security --something
about the way the tails make hard turns into the nipping
loops, which resist simple loop-enlarging pulling out.

–dl*

There is also the classic Carrick bend, which I didn’t pay much attention to as I was happy with the Zeppelin. Is there a reason why it doesn’t seem too popular? Seems like a nice joint…