About 44-45" for the Alfa and and 54" for the Resolution.
The boats will handle very differently. The Alfa is a very slippery design, with optimal hydrodynamics, the Resolution is more of a compromise, with a very narrow beam in relation to it's length, consequently the turning radius is more tanker like.
Either boat boat handles well, the Alfa is a nice 'backseat-of-the-car' size, so gets my vote.