I like dry and wet for different reasons.
One good thing for dry is when it's cold and not having to deal with the wet and the sludge
it generates, especially in the winter in my garage. it's much cleaner.
I can also see where I've sanded and how much I've sanded a little better with dry.
But mostly everyone has their own personal preference, you need to try both and decide.
Also, here's a picture of a hood I did recently initially sanding with 1500 grit
with a 6" random orbital sander, then 2000.
It's not "dead straight" but the reflections clearly show the amount of wave left in
the paint, quite minimal I think. This is as good as I will do for my normal collision repair work.