You have picked 2 boats that are on the extreme end. Slow blue water
sailor / Dock
Condo. Happiness is in the center not on the extremes for most people.
My feeling is bigger is better if you can afford it. A stout(strong?) boat does not have to be slow.
I drive an Beneteau
Idylle 51/1550. A well built strong and safe blue water
cruiser that is very fast.
It has a long modified fin that draws 6'4 but is about 12 ft on the cord. Tracks well but without the lack of performance of the PS.
The SO is not going to track well. It has a very short cord on the keel
and when it crests the waves it will not like to stay very strait without a lot of work
on the part of the helmsman or the autohelm
The B Idylle has lots of hand holds, you can move anywhere in the boat with easy in any condition. The PS will have the same. Both would be very safe boats out in the big waves. Out in big waves you will be thrown around and injured on the SO410. You are likely to lose your teeth on that boat.
Those 2 problems with the SO410 would put it out of contention for me. I also don't like plumb bows. You hit a dock
( I have seen it happen a few times, luckily not me) or a sea-can and you have damage. The reason it needs this plumb bow is because the wide stern is so buoyant that you need to get some floatation up front or it will sit bow down. This is not a good design.
The SO is also going to be pretty hard on the crew with all the slamming around your going to be doing with that shallow canoe body. By the time you get across to the Azores
your going to be exhausted. It is a sled which you sit on top of at the back.
The PS is out of contention because it is heavy and slow. This is not a compromise it is a bad design flaw (my opinion only) Will this boat even make 125 miles a day? That said it will be a safe and comfortable boat that when it does finally get you to your destination
you will not be completely exhausted.
The Idylle 51 empty weighs about 38k with mast
in no sails
. It is not slow. It is very fast. There is no reason to have a slow boat just because it has to go out on the blue water. Put enough spar on it so that it can be driven. Sailors have to reduce sail at some point so add in the option to go faster and start to reduce sail earlier.
That said, a PS or SO is better than no boat at all. They make all kinds of boats just like they make all kinds of beer
for a reason. People are different and like different things. There are people who will love these boats and who is to say they are wrong.
However there are all kinds of boats out there in the 40 ft range that are a better compromise than the SO410 or the PS40.