I use both stilts and planks,i prefer planks personally.But on clear houses / rooms always use the stilts for speed (domestic work) no site work for me!!.
Over the years ive NEVER come off the stilts but had several accidents from the planks 2 nasty ones.
I once witnessed by dad fall onto his trowel from planks and received a 6" cut along his wrist that needed stitches he also broke the wrist too.
The thing is when ur on stilts you know you gotta be carefull and you always got this on your mind, so your cautious!!!! but off planks you think your invinsable,and when your walking backwards not looking what off and in pain!!!.
The other thing with planks is you take chances, instead of building a safe H platform u'll just lay 4-5 planks across hopups bricks /whatever and lean across to meet run.This is how you get hurt.
At the end of the day you gonna fall the same height be it stilts or planks.
banning stilts aint gonna stop accidents trust me