title: NSViewController or NSWindowController to manage nib
body: <p>As far as good practices and resource usages (memory, etc.), Which is preferable method to use NSViewController or NSWindowController if either method satisfied what I try to do.  Opening another nib from another nib.  I can accomplish using either one.  The only differences are the instantiating syntax and calling syntax as below (initWithNibName vs. initWithWindowNibName and [nib view] vs [nib showWindow:sender])</p>
  
  <p>Any comments?</p>