Fantasy Football: Miles Austin or Roy Williams?

I have both, my lineup looks like this: Kurt Warner, Adrian Peterson, Ricky Williams (who got me 28 delicious points Thursday), Donald Driver, Miles Austin, Reggie Wayne, Fred Davis and the Saints defense. Here's who's on my bench: Rashard Mendenhall, Michael Crabtree, John Carlson, Roy Williams, Lesean McCoy and Nate Washington. Miles Austin explosive games has led defenses to send their whole team after him lol so should I play Williams instead? I'm tied for 1st in my league here guys, help a girl out. Please :)