The last time I painted wood for outdoors I went with the Behr exterior. 10 years later in one of the harshest UV climates known to man, it's doing great.
For stains and sealers, I recently built a deck with pine logs and tatajuba for the decking. I did a lot of research and settled on Armstrong-Clark. What I realized while looking (and I made up a ton of samples of various manufacturers to test), is nothing lasts in my climate for more than a year, especially on horizontal surfaces (deck is at 8600' ASL in Northern NM---lots of sun in the summer, and a bunch of snow in the winter). So far I've been happy with it. Easy to apply and their support has been exceptional (particularly when I called on a Sat. afternoon after applying the product only to have a thunderstorm dump on it!). Just be sure to prep properly (I wash with sodium percarbonate then rinse, then hit it with citric acid to neutralize it. Let dry, apply the sealer)
I live in Albuquerque and the weather is very tough on outdoor wood. YMMV depending on where you're living etc....