metal safety fence
We faced the same question last spring. We were having to replace the orange plastic safety netting every other year and a couple of times had to do some "creative splicing". We opted for a metal fence. We used 14ga welded steel "garden" fence w/green plastic coating. We just weren't that comfortable with the orange plastic anymore since more and more pilots are flying larger aircraft.
Yes, we figured that a metal fence would do more damage to an airplane than the plastic fence; but it is SUPPOSED TO BE A SAFETY FENCE and the purpose of a safety fence should be to protect the pilots not the aircraft!
Dan