EDDY "There are no longer any reasons to use Stuffit in OS X."
Yes there are silly. There's a whole ton of reason as to why we should use stuffit, the least of which being that everybody has it. First off, the compression is unsurpassed if set to the maximum setting. Second, the compression/decompression is very fast as compared to .zip, .tgz, .rar, .tar... everything except .dmg which I admit is very fast. Anyways, stuffit still gives us way better compression than the .dmg format, and since everybody with OS X (and most people with earlier versions of mac) have it, its totally worth it to keep using it!
Just my 2 cents
(Version 9.0)