Re: Cal 28 Vs. Catalina 27 livaboard
A few more more things - and this is if you begin exploring other options:
ballast. It makes a difference for a liveaboard. Having some lead below will keep you from walking the cabin sides everytime there's an errant 30kt. gust. Of course, that's literally weighed against the giant lever you have pointing skyward. Not making any commentary on whether full is better than fin or heavy displacement better than light -- only in the context of living at the dock.
second is storage: day sailors don't make the best liveaboards because there's no place to put anything. You need lockers and storage - you will fill them all no matter how hard you try not to.
For these reasons, a good rule of thumb IMHO is that a boat that is designed to cruise (i.e., tending toward more ballast with more storage) makes a better liveaboard than a racer or racer-cruiser.