No question about it, if you want to DIVE, rather than taking in
the "local colors" (which you can do anyway, on the days or two
before and after a liveaboard charter.

They are a toss up as far as the mother boat goes.  But the thing
you should look into more carefully is that TENDERS they use for
taking (and retrieving) divers from dives.

TWIN tenders, with shallow draw, and powerful mortors are a must.

Peter Hughes used to have tenders with twin 400 HP jet motors and
a clearnce of less than 12 inches.  You need the speed to chase
down blown away divers, to different directions, at Peliliu
Corner, during tide change, e.g.  You need to shallow clearance
to navigate the many shallow navigation channels near the dive
sites.

The report I found should give you an idea of HOW BAD the
condition CAN be.  :-)  12-14 foot waves.  We took a long detour
to dive the calmest site around, the Turtle Cove, near shore.
It turned out to have 8-foot waves and the dive lasted about
5 minutes because NO ONE, 9 divers and one DM, saw anything --
no shore, no bottom ... before scrambling for dear life getting
back on the tender.  :-)

http://tinyurl.com/7hk95

That was the roughest of the three trips.  Still very enjoyable,
and ADVENTUROUS.

-- Bob.