what is best zip app for mac osx 10.9

The question was zip/unzip. The tools mentioned only handle unzip.

You can create simple zip files simply by selecting "compress" on a folder.

If you want more advanced features like encryption you need a dedicated client. I know that both WinZip for Mac and iZip work, but I don't have any experience with them.

I too would like to hear some real experiences with dedicated zip clients for mac.

It already has one. Double-clicking a zip file will open the preloaded Archive Utility, and you can zip an item by control-clicking it and choosing to archive or compress it.

If the Archive Utility won't work on a file for some reason, use The Unarchiver.

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It's built-in to OS X. You don't need a third-party utility, but if you feel you must have one, then try The Archive Browser 1.9.1 and The Unarchiver 3.9.1.

The standard tool lacks a lot of basic functionality: browsing the zip archive without unpacking, adding and removing files to a zip archive