What do you want it for? Pertex and pile is an incredible good combination, lightweight, warm, windproof but its noisy. Swannie stuff isnt what it used to be now it isnt made in NZ which item are you thinking of? The shirts arnt that warm when used on there own as the wind just whistles through them, the thicker jackets and smocks are better but weigh a ton and more so when wet. They are however very hard wearing and quiet something the pertex and pile isn't something to think about if your moving through cover or using for stalking. Be a little careful with sizes with swannie stuff too as if you have a decent ape index the arms are fairly short. Both are good choices but for different things.