I guess not - just always assumed MDF to be easier to work with in terms of building out cupboards etc. I suppose i could go full belt and braces and build a thin stud wall but i was just going to batten the back wall, attach and then cross brace with fixed shelves...
From my understanding you should be ok with MDF as long as you seal it and it doesn't come into direct contact with moisture, but i'm just risk averse.
Have also seen things pull out of MDF, so trust ply more for hanging loads off. How heavy is the towel rail?
I guess not - just always assumed MDF to be easier to work with in terms of building out cupboards etc. I suppose i could go full belt and braces and build a thin stud wall but i was just going to batten the back wall, attach and then cross brace with fixed shelves...