I have owned both and will take the Sitka everyday over Rivers west. Now keep in mind the RW stuff was some of the first. It was horrible for stop and stalk hunting as it didn't breath at all. And when I did get caught out in a downpour I was soaked to the bone. I don't wear it anymore. I have the sitka stuff now and love it. it breathes and sheds water very very well. I have not got caught in a downpour yet with it but I did stand outside all day in a steady drizzle. The outer layer was wet but I was bone dry. and it dried about 15 mins after I got inside. This was with a 90% jacket not the downpour gear. I'll be checking out this new stuff as well. good luck