Who do I start? Crabtree or Steve Smith (Giants)?

Crabtree vs. the Titans (NFL worst pass defense)
Smith (G) vs. the Chargers (6th best pass defense)

With an easier defense, a QB who seems to be improving (A. Smith), I want to play Crabtree. Especially since Smith had three consecutive less than great games, BEFORE last week, where he played fairly decent. So who knows? Right now I have Crabtree in my lineup, but it's making me nervous for some reason.