We have been in our L450 beside an L440 in Las Palmas
the Canary Islands. Both were loaded up, ready to cross the Atlantic with 5 people and lots of provisions and toys for long term cruising
. We had 700l of water
and 1000l of diesel
. Our 450 was still floating high above the water
line while the 440's transom was deep in the water. So I believe the load carrying capacity of the 450 is bigger. Standing behind the two boats one could see that the hulls on the L450 are much wider and the deck
is level out to the side. The L440 deck
steps down. This must account for much more interior
living space and would explain the hight load carrying ability.
We went out for a demo sail of a Parasailor on the 440 and I was surprised how uncomfortable the fly bridge is compared to the L450. Underway, we spend 100% of our day time on the fly bridge and go about 50-50 in time between fly bridge and nav-station for our single-person night watches.
We installed a removable cover for the fly bridge cutout in the cockpit
roof to prevent the rain to come into the cockpit
and made our own roll-up vinyl windows and sun screens around the cockpit. Both will keep even driving rain out.
For us it is clear that the 450 provides the more comfortable living space.
As for performance - we started the Atlantic crossing
in 20 knots winds, 3 meter waves on beam to close reach then broad reach. After about 6 hours we were within 3 boat lengths of the 440. Unfortunately, they had to divert as they discovered a hydraulic leak in the autopilot
so we can not compare the long term performance. We crossed the Atlantic averaging 185Nm/day in strong wind
conditions. We had up to 4m waves and up to 42 knots of true wind
. Almost every night we saw squalls with windspeed in the lower 30s. Still, we would have proper sit down lunches, even with glasses on the table.