IMO the bonus you give depends on the formation you play. If you play something like 4-3-2-1 or 4-2-3-1 or something were 5 midfielders are spread across 1 or 2 lines, we should use the possession bonus. In defensive, counterattacking formations like 4-5-1V or 5-2n-2w-1, the condition bonus helps, the players run at rocket speed. But it ain't advisable to use possession bonus while forcing counters. The attack and defence bonus depends on the situation of the game. I'd keep the defensive bonus to wait till the 70th, since you'll stay back for most of the time else.