I'd go with the Joe. Given's form wasnt of the highest quality this season in my opinion and while he did well he didnt win us as many points with his efforts between the sticks as he did in half a season last season. Plus Joe commands his area. Though they both flap at crosses.
Regardless, i think its key that in pre season Mancini sorts out the pecking order between the sticks early so we can get a settled backline.