Welcome to the forum.
Well you can justify just about anything, but generally sailboats make less than desirable powerboats. A sailboat will have smaller accommodations and isn't as heavily built as a powerboat, plus has a host of configurational differences. Simply put, you can power a sailing cat, but she'll never be a power cat, in regard to performance and the interior will be comparatively smaller as well.
Folks make sailboats into powerboats all the time, but the conversion process is usually more then just slapping on a big engine, which can be daunting to some. Of course some cats are better suited than others for this conversion - which cat did you have in mind?