I have found listed here in GA that it doesn't make a difference much in case you are using the frequent skinny decking due to warmth. You are going to still need to maintain the deck routinely to make it previous. PT 2x6's are all I use now for decking. https://bookmarkedblog.com/story9244131/not-known-factual-statements-about-does-pressure-treated-deck-need-stain