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Isn't T&G chipboard the usual goto for subfloor?
NotThamesWater-
Ply is normally > chipboard if he can afford it, stronger and stiffer for a given thickness. Also less prone to fall apart if it gets damp (see above).
It all depends on the exact usage case though, we're having underfloor everywhere so we're using 18mm T&G cement boards (No More Ply) because they have better thermal and acoustic properties. They're fireproof too. Just more expensive and heavy - I had to unload a half pallet of them yesterday which is half a tonne so that was fun...
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could be that or external grade ply, I imagine they'd want to use the one with the least flex. I don't really care apart from the price.
Fox
Sumo
1 = original floor boards
2 = OSB boards in the extension
3 = ply that was on top of the floor which was tiled