I don't think you can go wrong with either. I agree with what someone said earlier that Sitka has specific gear to keep you warm and I don't think Kuiu has as much for that. Kuiu does have a good fit.
I found that my arrows did not fly consistently with the Montec or close to how my arrows flew with my field points. I switched to other fixed blade broad heads (Exodus) and they were much better and accurate.