valvoline max life atf

ya napa has dexron/merconIII and valvoline max life atf and valvoline dexron/mercon.
i couldnt find +3 anywhere, i guess only 1 brand still makes it and the transmission shop i go to orders it in 55 gallon drums. thats why im asking, should i run regular dexron/mercon or the max life? i have heard good things bout it from other people, just didnt know if it was ok to use in a freshly rebuilt transmission?