Have a read here: http://www.wilhelm-research.com/book_toc.html. It is mostly about colour but there is some B&W info there. IIRC (which I may not) they rated modern RC prints at 100+ years - more if selenium or sepia toned.

I like the feel of fibre, and the lack of a plastic film over the emulsion, complete with the paper's fine texture, is the deciding factor for me even if much of this is lost when under glass. Having said that, I have a soft-spot for Ilford's satin finish RC (not the pearl - the most popular of course - which I think is horrid !)...

Bob.