With 1440 Super setting on my Epson 3800, the Canson Baryta has a pictue-perfect black ink curve in the QTR calibration plot, and reaches a Dmax of 2.56. At 2880 dpi, it reaches 2.57, but that's after flattening out for about six steps at 2.53. It seems to be engineered to work with 1440 Super.
Canson Platine at 2880 flattens out at 2.47 and stays there for the last 5 black steps with the QTR calibration chart, but that's after a rather sudden change in slope at 2.35 4 steps before hitting 2.57. See my website technical section for the charts. The Platine surface is like a miniature luster, and the Baryta is a little less so.
The Canson Baryta produces a curve at 1440 Super that is nearly identical to the Gold Fiber Silk at 2880. The GFS paper, however, is whiter with an L of 98.05 vs. 97.66 for the Canson Baryta, and 97.06 for the Platine. If you like a cooler tone, the Platine is slightly cooler than the other two, but all three surfaces are fairly close to neutral in color. The backs tell another story, with the Canson Baryta being warmer in tone than either the Platine or the GFS.
Aloha,
Aaron Dygart, Honolulu