My take on this as a pontoon boat owner.
I have an ugly old 20 ft pontoon boat made by liteweight caravans, heavily modified Because the pontoons actually protrude much lower than the hull by about 15 mm, and extend out the back of the boat about 1/2 a meter, they really do make it extremely stable, they drag in the water while cruising as well so it sits very flat.
The new pontoon boats such as senator, when you look at the hull shape itself, other than a turn down at the edge, the hull shape is not significantly different to a normal monohull. I have found them no more stable at rest. The pontoon is more internal and provides both strength and buoyancy up high, meaning the boat is less likely to capsize if swamped.

MY good mate has a Senator RH 680, it gets driven hard at times, but usually cruising. Geat Barrier on a day when most were not venturing out, was a comfortable ride. We often take 7 or more kids out on it. Big heavy boats are more stable and handle seas better.
Beamy boats are better at rest, deep vees nice ride.
You need to ask yourself what is more important?, being able to go balls out in crappy weather(would you actually take your family out?), or a comfortable stable fishing platform.
Coming home slowly if it gets sloppy is not such a big deal, especially with the more efficient motors these days.
Trimming the nose up in bad slop might keep you drier, but the boat will pound and bounce, keeping the nose down gives a softer but wetter ride at moderate speeds.