Denny, from my experience there isn’t a product yet that will hold up to weather well and for a long time, in other words close to bullet proof.
Take a look at what happened to vinyl and aluminum sideing. The manufacturers said you’d never have to paint your house again, I’ve painted several houses with aluminum sideing and they do make paint for vinyl sideing and it sun bleaches and does become brittle because it dries out.
Sun and U-V rays are the culprit in both, the vinyl sideing becomes brittle after time and the paint on aluminum sideing Oxydizes to the point where the aluminum shows through. The point it the distructive weather will age anything plus any product that is chemically close to PVC.
I do know the way they treat lumber today is a better formula then it was, plus paint and stains are much better then they were 20 to 25 tears ago too. I mix up my own treatment for treating wooden decks and I know its better then anything on the commercial market. I treated a deck and a fence two years befor the flood here a few years ago and seen what it looked like last year. The fence and deck were both under water for a week and when I seen it, it still looked decent and didn’t need to be treated again.
When maunfacturers say you’ll never have to do something again, wheres the proof. I want to see a 30 to 50 year proof and there isn’t any. So what I’m saying is check out what the products are made of, Just because its a new product doesn’t mean much unless its been around for quite a few years. Its fairly easy to treat a deck with a bug sprayer, a drop cloth or two and a brush to back brush with. If treated right and every few years a wooden deck will last for along time and you can easily do it yourself, all it takes is a saturday once every 3 years and they will last a long time.