So far I've done the Sand Dollar, Bottom Scratcher, Sun Diver, Second Stage (6-pack), Spectre and Peace.
Favs or best experiences have been on Sand Dollar, Sun Diver, Peace and Second Stage.
I have been diving Sand Dollar most because most of the people I know dive on it and I know the crew.
The Sun Diver has been great the two times I've been on it due to the site selection, the captain, and believe it or not the galley (I thought the burgers were fine and I'd rather pay and get what I want than get chow of the moment for the masses). I expect to be diving the Sun Diver more, and probably will do some more open boat days as I just did a Fundamentals class and I know there tends to be a cadre of dir types on those days. I love it when the captain continually picks fresh dive sites. That's probably the most important thing in my book. The last time I went we started at Lands End, then went to Johnson Rock and then Indian Rock... very cool. I also like a challenge... when we were at Lands End it was pretty lumpy on the surface but we stuck it out and it was worth it once you got underwater.
I liked the Peace as I thought the boat was spacious, and the crew was efficient and organized without being too overbearing about it. I went to San Miguel with them and I thought it was great how they said we were gonna do 4 dives and kept us on schedule. I have to drive 2.5-3 hrs from the Inland Empire to do this boat though. I really don't mind the drive.
Second stage is just a nice and relaxed diving experience as its a six-pack. It pumps hydrocarbon free air, too.
I can't put my picks in any strict order. They're all great boats IMO.