It's really interesting how one diver's favorite is another diver's least favorite.
True. My 5-day limited load live-aboard trip about Truth Aquatic's boat the
Vision was really nice, but I'd read in advance about the local California dive boat culture. Compared to the 2 Caribbean live-aboards I've been on...
1.) The TA trip was much cheaper. Food was fine & plenty of snacks (candy bowl) put out. 'Room' was a bunk. Pick up dive setup (BCD on tank) from floor & carry to a bench to gear up. No dive guide. Solo or not, up to you, nobody requiring a specific cert. or solo gear that I recall. Rent your tanks & weights from the dive shop, separately from the live-aboard itself.
2.) The Caribbean live-aboards cost a lot more; crew in uniform, crew member made my bed, sun deck with lounge chairs was much more elaborate for laying out, one had a hot tub (but one didn't), a complementary chocolate on one's pillow at night I think I recall, hot chocolate with berries after night dives (even better than it sounds!), on one crew took my fins off before I ascended the ladder to exit, there was an optional-to-purchase video of the trip offered, free guide every dive, one one specifically no solo diving allowed (I don't recall about the other).
So, depending on what you're looking for, and are willing to pay for, one or the other could be highly preferable. I didn't really 'prefer' one over the other; I knew what I was getting each time beforehand, pretty much, and I got what I signed on for.
Richard.