I only have the sitka. They work great for me. They are the only hunting clothes that actually fit. We have a lot of briers in the S.E., and the fabric gets picked out from the thorns tearing at the fabric. I have not tried Kuiu, but I imagine it would be the same. Not a complaint, just an observation.
The pockets are just what I need. I have a system of what goes where, and it works with Sitka. You probably won't go wrong with either. Do you have a buddy/shop with any of the clothing? See if you can try it on first.