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WinRAR has one thing that Zip/7Zip doesn't - support for packing the files including their NTFS streams.
Now I'm not saying it's very useful (or more important than speed or compression ratio)... more of a curiosity. But if you wanted to pack files including the Internet Zone information for some reason (which IE used to store in NTFS streams, AFAIK), it could be helpful. :-)
I'd also say many people use the packer (and especially the archive format) they are used to; the change is slow, and often needs to be pushed by something your current packer just can't do and you need it.
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