When conditions are good you want to be on the flybridge.
When conditions are bad you NEED to be on the flybridge.
A single screw is harder to dock, but it can be done and offers the economy of
less fuel usage and half the maint.
I have heard the old saw about reliability of twin engines, but usually the
engines share a common fuel supply and as bad (or no) fuel causes most of the
trouble I feel OK with a single.
God luck!
Mike