Plus, check the forward visbility from the cockpit help position. You will find that the deck saloon gets in your eye-line OR you have a high cockpit with the extra motion that involves.
And of course raising the coach roof means higher CoG, higher boom, therefore smaller sail area etc etc.
I think a deck saloon starts to
work well on hulls that are 50ft or more in length, but below that there are many compromises: too many? You decide.
I seriously looked a smaller mono deck saloons, but decided they were too much of a compromise