The two ZIP and RAR formats of WinRar are still different, so the ending has to be either .zip or .rar.
Well, of course I voted for RAR.
But as you probably almost all know, to convert all the archives on the site from ZIP to RAR would take heck of a time, so it was decided to not to convert them. In that case the vote is only interesting for seeing how many people would like the idea of converting...