[elindauer]

You should make up any missed value bets on the river, pick up some extra money from total bluffs and calls from very weak hands that would have folded, etc.

If he's so passive that he won't ever raise the turn with a hand you can beat, and he won't bluff the river after you check the turn, then yes, betting the turn becomes the better option. However, at 100/200, I suspect you don't see many players like this. Even the passive ones are probably pretty aggressive.

-Eric