I have a St Francis 44 MK II, and have been aboard several catanas and the Voyage. Regarding similarities, both the SF and
Catana are great sailing boats but I would give the edge to
Catana for upwind sailing. Both would be great boats downwind or on a broad reach. Very different boats when it comes to cost and appointment of the
interior. The Catana will largely be far more plush with generally better finish, but with less space. The St Francis has a larger
galley, and probably more
storage. The SF will cost less than the Catana by 100k or more.
I'd say the defining difference between these boats is their cost really and all that this implies. Both are made well, both use foam cores, both are truely good
circumnavigation boats that should be treated as more performance boats and not loaded down with a boston whaler on the back.
But I wouldn't minimize the costs of cruising and outfitting a
boat either. You may easily want to spend 35k to bring a
used boat up to par.