I seem to recall SRTing swildon's twenty I wondered why the hang drops down with the water rather than away from it, I guess it's a ladder/Mendip thing?
SRT is definitely safer though just look at how many historical falls have happened on ladders, compared to SRT. I think you will find based on statistics alone SRT is far safer and can also be done solo and still be safe unlike ladders.
However ladders still do have their place, namely on expeditions where you want to drop a load of holes in a day to see if they go, in this case they are perfect as you don't need to worry about rub so don't need 20 bolts to rig it safely and instead you just bung a couple of stakes in the ground and chuck the ladder down.