This is the most important question to be asked as well as where are you from? What climates are you hunting....
Spot and stalk - I am a HUGE Han Wag fan. I have the Tyst GTX boots and absolutely love them. Heard great things about Crispi's as well. If on more of a budget, some of the lowas will give good quality for a cheaper price.
Treestand sits in cold weather, to me, nothing beats an insulated rubber boot. If I am not doing spot and stalk, I only put on my artic muck boots and haven't once had cold or wet feet.