I am looking for paper recommendations (the application is a 1 off book). Here are the specifications needed: 17x22 or A2 size availability, double sided - here is a kicker, a good to suberb DMAX. I am flexible on the finish. I initially wanted glossy but then I realized I have not seen glossy in a book ever so matte or pearl finishes are OK with me.

So far here is what I have gathered as possible options:

Hahnemule Photo Rag Duo
The most expensive of the bunch. Is it really head and shoulders above the rest or just good marketing?
276 gsm, 100% cotton
White
Characteristic, beautiful defined felt structure
Double-sided, matt premium inkjet coating for outstanding print results
Acid- and lignin-free
ISO 9706 conform / museum quality for highest age resistance

Canson Infinity Rag Photographique Duo
Claims to have the highest DMAX available
100% Cotton Rag Base
Double-Sided Coating
Basis Weight: 220 gsm
Thickness: 13.8 mil
Whiteness: 89.67%
No OBA Content
Acid Free and Internally Buffered
Instant Drying
High Water Resistance
Surface Finish: Smooth Matte


Moab Entrada Rag Bright 300 Paper
Uses optical brighteners. I am not sure if this is a pro or a con.
Machine-Made 100% Cotton Fiber Base
Basis Weight: 300 gsm
Thickness: 22.5 mil
Brightness: 103%
Whiteness: 95%
Double-Sided
Utilizes Optical Brightening Agents
Acid Free and Calcium Carbonate Buffered
Water Resistant
Surface Finish: Matte