Digital BW, The Print

What do I need to know about these two papers for B&W printing on my R2400?

In the past I've used the Epson Enhanced Matte for daily printing and the Aurora Art for my 
"best" work. However, I find that the Epson paper has a bit more pop and slightly better 
dmax and shadow detail.

I was under the impression that the Aurora would last longer (more archival) due to the fact 
that it was cotton and has no OBA's.

It's difficult to digest the piecemeal information out there.

As I understand it there's two factors in judging a paper's archivability: 1- image fading and 
2- yellowing of paper. Is this the case?

If so, what does that mean for the two papers in question.

fwiw, i display most of my prints in art portfolios/dark storage.

Thank you all...