OSB or plywood -- which the better deal
I have had a 24 x 40' "pole barn" built. Actually a Wick building. But about the same as Astro or Cleary or Morton. It's un-insulated -- just a "tin skin" outside of a few 2x6's that are between the "poles"... which are actually three 2x6's joined together.
I want to put a plywood (or OSB) "inside wall" between the poles (which are on 8 foot centers) as a protector from bumping (and denting) the metal as I work and park equipment and such.
I MAY go up a full 48" ... but might rip the 4x8' sheets to 39 or 40".
THE QUESTION: whether to use OSB or plywood -- which is the better deal?
I know there are different thicknesses -- like up to 3/4 or 7/8 or even a full inch (?).
It seems like OSB is a little cheaper -- is it as strong as ply? As impact resistant ?
Looks don't matter -- knot holes and such don't matter -- it better be dry inside, so there's no need for any exterior grade.
Any opinions? Thanks. J