I've used almost every A/T tire on the market and about half of the M/T tires. Hands down, not even close, the best tire I've found for WET conditions is the Falken A/T3W. Those are just amazing. They worked magic with that rubber compound. Hook up like a cat on carpet. Rain, snow, dirt, towing in the summer heat, those tires just don't care.
The A/T4W just came out last month and now I'm running those in the 35x12.50R18 flavor. So far they are even better. Very quiet, smooth as glass, amazing traction in all conditions. Exactly what I expected from Falken.
As far as brands to avoid at all costs: Goodyear, Nitto (****to), Toyo, and some Cooper tires are just plain awful. I don't think I'd run a set of Nittos if you gave them to me for free. Not worth the danger when the roads get wet. And don't even get me started on the Goodforayear Duratracs. Those tires are allergic to rain.