winrar is more standard in file compression. and i agree with the annoying registration from winzip. But winzip is a classic, i wish they continuing develop the winzip.
I'm frequently using winrar because it's easier and more files i downloaded is usually at winrar.
Winrar would be my choice because it has all the extension of a compress file. I'm using it for almost 7 years and I don't have any problems encountered on that compression software.