Should I start Greg Jennings or S.Holmes? 5 Stars awarded?

I'm in a MUST win situation this weekend. I can trade Greg Jennings for Santonio Holmes. I have Roethlisberger at QB. The guy I am playing has A.Rodgers at QB, who do you like to have a better game this weekend and why? Jennings plays SF, Holmes plays KC. Expierenced FF players advice both preferred and appreciated. Thanks guys!