Fantasy Football, Antonio Gates or Dallas Clark?

Who should I start? I have Gates as my starter and Clark as bench. Both are studs. SD don't have much people to throw to, but Gates has a toe injury which may limit play and also they are base on the ground game. IND have lots of people to throw to and they attack through the air, which may limit the amount of going to Clark. SD are playing CAR and IND are playing CHI. CAR and CHI are not high caliber teams. I need some help and suggestions.