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Slower, because of air resistance. I would guess that since the light plastic puck is going to have a very short impulse time (it will leave almost immediately after it is made contact with the stick), it won't be on long enough to accelerate. The heavy puck has a longer impulse time, since it is heavier, so it has more time to accelerate as the stick pushes it along at a longer distance and a bigger rebound from the stick flex.
Weaker players will probably get more on the shot with the plastic puck, but there would be a point where stronger players overcome that and will get a lot more on the real puck.
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