Bayrita is a new addition to papers by almost all manufacuters these days. It does make whites whiter but it allows the emulsion to sit on the surface of the paper not saturating into the paper base. I believe it's a profit thing and not a quality feature although sold as such.
I compare reprints of my old work and can see a difference in what you say is a subjective observation. Perhaps it is subjective but I do like the feel of my older prints. Maybe it's the patina of the aging process or it may just be the difference between salted papper vs the new emulsions or the Bayrita layer. All I can say about paper today is it all stinks. I find my mid tones are lost although i am getting beautiful negatives as compared to my old Plus X and Tri X, very grainny negs in comparrison to the TMX TMY films today. Maybe agin something subjective but I am having a dificult time finding a good paper.
I hear Illford MG FB is a very nice warm paper. I like the warm tone of Agfa's Bromide papers like their Portriga which has been replaced by Record Rapid which doesn't have the same warmth but is a close second. I tried their ART grade paper and am dissapointed in it.
FB is nice to work with, I don't like the plastic feel of RC and I don't have an RC dryer. I also like the smell of FB in my drum dryer.