I have all 3 on my PC, and I tend to use 7z for packing things, but I don't tlike the interface on it for unpacking, so WinRar has taken over that, although WinZip is still used the most often since the majority of things I download come in zip format.
I think 7z generally has a small edge over WinRar, and does have the advantage of being freeware.
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