6/5 because it unstacks the six point and slots a valuable point. With four builders aimed at the slot it's almost certain that he'll make it if we roll one of the 21 rolls that miss. And when we hit him our lack of board and his advanced anchor means he's still in good shape.
The alternative is to make the ten point, but that's not nearly so valuable as the five. Of course, making the 10 vs just slotting may make that the better play. I'm not actually sure which is better, but the slot is definitely sound here. All the safe v bold criteria say bold, so the slot is probably correct.