Sure, I looked very hard at 410 Lagoons and 42 Mantas too.
As for the 410 Lagoon, it is an "old school
The 570, 470, 410 and 37 all have relatively narrow hulls that get even narrower aft.
The 380 ushered in a complete departure from those old designs, and all the new Lagoons, to this day, are spun off from the 380's new turning point in Lagoon's layout.
The new design incorporates much wider hulls and with a much wider transom on each hull. The trick was to come up with a hull shape that was still fast enough.
Conventional catamaran wisdom had always required narrow hulls for speed.
The 380 took a big step in going for wide hulls and still managing to keep speed in an acceptable range.
This did several great things.
For one, the extra width aft allows for comparatively huge aft cabins. The 380's aft cabins are significantly larger than those on a 410 or Manta
The wider hulls and transoms also allowed for much greater load carrying capacity aft, and the relocation of engines outside the living quarters and into SUPER accessible aft engine compartments.
With no engines under the bunks, and wider hulls, the 380 has much more storage space than a 410 and a better ability to carry that additional stored gear
In all fairness, the 410 is a better sailing boat, has a bigger galley, and more heads and accomodations for a larger crew if you need that, but it was not the boat for our needs.
We were not going racing
or weekend sailing, we were going cruising.
And even so, I was never "left behind" and routinely performed in the same speeds as the 410 and Manta
42. Once all these boats get super loaded for cruising, they are a little faster than comparable monohulls and nobody is setting speed records. We averaged a little over seven knots over 17,600 miles to date.
We found the 380 to be better for cruising as a couple because it has much more storage space, better load-carrying ability, and is so easy to service
As an example, I can change the entire seawater cooling
pump on one of my yanmars in less than five minutes, literally.
On a Lagoon 410's port yanmar
, you have to unbolt the engine from the mounts and jack the whole engine up to get the seawater pump out, because the engine is sandwiched into such a tight space. And you do all this work under a bunk in poor ambient light.
The differences in serviceablity are nothing short of astounding and, except for the trademark Lagoon vertical salon
windows, there is little in common between the 410 and 380.
And also, there were other issues too, such as the 410's halyard winch
being located on on the mast
base, requiring you to go forward offshore to handle sails
. Mantas even have a hank-on head
sail to deal with offshore . . . we wanted modern, all in the cockpit
and the 380 has that.
In short, the 380's "new and improved" Lagoon design change attributes made it a no-brainer for us.
That does not mean folks have not been extremely happy on Lagoon 410's and Mantas too. They are fine boats.
410's are a great boat in many ways and the old school
layout of the 410 might suit your fancy better than a 380 for whatever reason. They are venerable blue water cruisers that do a fine job overall.
So, just pick one you really like personally and you can't go wrong!
Hope this helps and best of luck,