Well, you are on this site so you will fairly gradually realize you need maybe six or seven saws with different bars, cc's, etc., and a passle of chain-types. Won't go in to all the other stuff. But for what you are proposing to do, I would go with the 361. If you are younger, stronger, and heftier than I am or don't care what your forearms and wrists feel like after six hours of cutting, one of the larger saws you mentioned are great. Of course, back to being on this site, you need both. Which I'd have if I had the money.
You didn't mention the size of tree you'll be felling/sectioning, and that could lead you to wanting a longer bar/larger saw...than the 361; however, I find the 361 size, with a 20" bar [I don't have one, I have an 036 Pro, about the same size] good for all the chores you mentioned including limbing. A smaller saw would be a bit handier for limbing the smaller stuff, but I am happy carrying/hauling one saw to a job site since I am usually unable to drive right up to where I'm cutting and have to walk in. One saw is enough for me to carry.