Decreasing at top of a hat -- K2tog or SSK?
What is the best way to decrease at the top of a hat? Some patterns call for K2tog, some for SSK. Some say to knit a round between the decrease rounds. Also, how do I know how many more inches my decreasing section will add to the length of my hat? I'm looking for some guidance from all of you about what you find works best when you've made hats.