Slowsuki and Deadwood,
it looks like we have about the same size of wood to cut.
I have been using 15" bars mostly on both my Husky and Stihl, and 16" on the old Jred (bucking mostly).
The 18" bar on the 361 will reach trough 90 to 95% of my trees at stump hight, and is usually the bar I choose for felling. I am a bit undecided at the moment on which is best for bucking, but 15" and 3/8"x8 sprocket is the preferred combo for limbing.