I would offer two relevant considerations.
1. Ilford Imaging is in financial trouble and is bankrupt, so I worry about what this means for their products longer term.
2. The Mono Silk appears to contain OBAs at more than a low level. Papers with OBAs are showing much poorer results in fade testing.
I second the Canson recommendation. They are my paper of choice for B&W and colour, together with Cone's Type 5 which is similar for B&W although prints a bit warmer with his K7 piezography inks.