Digital BW, The Print

can anyone comment from personal experience, on the longevity 
(yellowing etc.) of Epson Premium Semi-Matte vs. Epson Premium Semi-
Gloss?

both are nice papers, and i have used EPSG for some time, but i'm 
experimenting a bit with EPSM.
if it has a tendency to yellow (but bronzes less i know), i'd like to 
know BEFORE i hang a print on the wall.

 thanks to all
 evan