re: Porch ceilings: t&g pine or cedar or beaded Hardi sheets?

I did T&G pine, beaded board. Stained and sealed. Haven't made a year yet, so can't give info on maintenance, but that was my same worry. I was told that hanging Hardie overhead is a no no. I looked at something called "smart board" which was OSB wth a hardie layer. But I think it only comes in smooth finish. Floating hardie seams always looks crappy in the long run.