Two pawns. I generally find it easier to have compensation for an exchange rather than have compensation for two pawns.
What do you prefer?

It is very dependent on the position. If it is very closed, I would rather be up the exchange, as I prefer being able to squeeze the life out of my opponents without getting any pawns off the board.
I know most of you will say it pretty much depends on the position but - generally speaking - what do you prefer: to be up an exchange or two pawns?
Go, Intellectuals !!