For me it used to be two reasons: * 256-color support. This was added in Lion I believe. * There's a really weird bug with word-wrapping that only manifests

For me it used to be two reasons: * 256-color support. This was added in Lion I believe. * There's a really weird bug with word-wrapping that only manifests itself in Terminal.app: http://superuser.com/q/46948/5966 http://superuser.com/q/46948/5966 As of 10.9, I believe it remains unfixed.