Do you tend to play turn-by-turn or several turns in advance?

[incidesi]

Swapping strategies with other players, I've found that there's a divide between people who (generally) play turn-by-turn and those who plan several turns in advance. Obviously you have to do a bit of both to win, but which rules do you generally follow? Do you count each wit and make sure you're gaining wits over your opponents on a turn-by-turn basis or do you focus more on placement of troops to advance across the board in a consistent way between games?