Build the shocks with bladder when the track has big air and/or very rough. Use the emulsion build when its fast and smooth. Bladder builds say very consistent thruogh the entire run, emulsion shocks change due to the air mixing with the oil in the shock, which makes it feel lighter. Building the shocks bladder with a vent in the side makes it easier to get it right. Opening up the vent on top with the bladder feels less progressive and slows rebound. I personally will always run bladders.

The shocks are the same between the buggy and truck, so it doesnt matter.