and free
Winrar is free, in a sense.
It's supposed to have a trial limit but it doesn't de-activate after that...
And it doesn't come up with any "buy now" notices if you're just extracting or compressing.
I like Winrar, but unfortunately, if I'm looking inside a zipped folder, I have no idea what's going on if I use WinRar.
Whereas with 7Zip, I do. But I don't often use 7Zip unless a scenario means that Winrar is being tricky with me.