Kitchen Unit Carcases, MFC or MDF

Looking around most Kitchen Units use MFC (Melamine Faced Chioboard) but some of the bigger (better?) manufactureres use mdf to build the carcases. The impression is that mdf provides a more robust carcase.
So is mdf better than mfc for carcases? Does it tend to be used mainly for bespoke kitchens?
Where could I buy mdf carcases. Not much joy googling for mdf carcases, all the sheds seem to have mfc carcases only.
usenet at lklyne dt co dt uk

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