Plywood for Bathroom Subfloor
Depending on the direction of the joists, it will only take 1 sheet, the T&amp;G will have no value, unless the floor you pulled up was T&amp;G as well, then it will only help on one edge.

If the T&amp;G was cheaper than square edge, then I would use it. I have seen it cheaper in a big box store, although I could not figure out why it was. It was not on sale....