Good question & one I'm not sure there's a correct answer to. Up to around 10 years old, our daughter had (good) BA jackets, Crewsavers iirc. They offered good insulation & didn't rely on any gizmo to work. If she went in at least I knew she'd float. We all now have autos, I carry a couple of spares & a re-arming kit. There's been a couple of occasions when I've thought that manual jackets would have been more useful, especially launching & recovering etc. I think for small kids, BA is the way to go, for adults, manual or auto LJ, there's a case for both. I'm currently looking at Hybrids for my next pair, as all mine are coming up for service. So I might treat us to a couple of these
next year & opt for the manual version.
We never differentiate what kind of trip we are making, if we are out on the boat, we are out on the boat..