Working in Alaska as a guide is the best test for drysuits. Having worked up there for 3 seasons I have seen NRS suits come and go. Sometimes being dry for a week only. The water is glacial and full of silt which is hard on gear. The Kokatat is the must durable but the gore tex socks leak after a short time.
Most people will not put this type of wear and tear on a suit but most suits don't last a season on the river up there without leaking a little.
Personally I would take a Palm or IR before NRS, with Kokatat on top.