which would you use and what do u think would last longer?? t1-11 is cheaper. it is going on a camp
Dave
I'd use 5/8" T1-11 over boards just for the shear strenght you'll get out of sheet goods.
Just keep it up off the ground by at least 10" so rain splasing up won't be aways getting the lower edge wet, which will lead to de laming of the plywood ,
BTW I'd use plywood over a strand "type" T1-11 if it where me.
If the boards are the look you want just use plwood or OSB as sheathing and apply them as siding.
Good luck , PEG