RAR is one of the most used compression formats all around the world. Now RAR is available for Mac, but the Mac version doesn't offer a Graphic User Interface, so you have to use it from Terminal. RAR achieve better results than ZIP, its optimized algorythm can compress files and create smaller files because it uses different patterns depending on what it has to compress: video, image, text, etc. It can create autoexecutable files too.
Notes
Bandizip is a powerful archiver which provides an ultrafast processing speed. Mac users interested in Rar os x 10.5.8 generally download: WinRAR 5.91 Free WinRAR is a powerful compression tool with many integrated additional functions to help. Use windows on mac without bootcamp.