Hmm, from a practical point of view, the ply is a quicker option, but you miss the opportunity to pack and straighten out any bows in the wall. Mind you, you have steel studs, so there shouldn't be any defects. Battens will be cheaper, but the ply also gives you more opportunities to fix the vgroove. Both ways have their merits, what do you think @MudRunnerTD
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