The smartwool is thicker I think. They look it. I prefer bridgedale socks generally. I find they wick better and hold less water than smartwool. I like to wear a liner sock in winter inside a heavier sock.
I have a Rab Generator smock and I really like it. It's very warm and packs small. The pertex has a lovely feel and gives good water resistance. I use it pretty much year round. The gilet is about 60 grams lighter at around 280 grams I believe. It would be my recommendation if you are going synthetic.