title: NSKeyedArchiver or [NSArray writeToFile:atomically:]?
body: <p>Well I just saved the same data twice and using NSKeyedArchiver the file was about 30KB bigger (from 60KB to 90KB) I know its not much but I'm going to have more of these files and some will be bigger than others. So whats the difference and what are the advantage of using one of the other?</p>