This is all talk about film. Consider also papers.

In both cases the strongest company with (coincidentally, or not?) the best products is Ilford (this thread is in the black and white sub-forum of course). Try looking at some sort of commercial deal with the Ilford importer in to your country, cutting out third-party retailers, or trust that the company will survive.

For the colour materials I'd have to say to try both manufacturers, but don't expect their film to be around in a few years. RA4 paper may also be superseded by the dry-technologies which are becoming available for commercial-scale photo-finishers, so try to get a big fridge I suppose (not that paper will last very very long).