Can't get out there anymore Mossman
Agreed hands down on the Paradise Dancer for quality of boat, crew diving and location. Roomiest liveaboard ever.
Hey, I was taking the "in your life" part seriously. Maybe it could happen again.
If we're talking existing boats, I'd probably rank my Galapagos Aggressor II trip as tops if you include the entire range of factors: incredible diving, great food (outdoor kebab-a-que was outstanding one night), excellent staff for the boat and the diving/land-touring, comfortable cabins (side by side, not bunks in my room), and no "issues" of any sort the entire time. Next might be a tie between the Palau Aggressor and the Truk Odyssey, both practically flawless boat experiences as well as dive experiences, but they didn't have the whale sharks that catapulted GA II into my #1 spot.
The Tahiti Aggressor might have topped them all, not in terms of boat quality, but for the diving - no whale sharks, but it was still pelagic heaven and much warmer water!
Cocos was great diving, but the Okeanos had too many issues on my trip to keep it from any serious ranking.
I do plan to dive Raja sometime soon having heard from too many that it really may be the best diving in the world, though not sure yet if I would try Dancer (wasn't so impressed with Sky Dancer) or Arenui or ??? (I also tried the Kararu, when we did Komodo, but it would be an entirely different boat in RA.) That's well over a year off, probably more, so I'm sure the list will be slightly changed by then and I'll make sure to be a prudent consumer and check reviews in all sorts of places.
