The safety is in YOU, not the stand. Whichever you use, you have to make sure its safe before you hunt. I like hang ons because mine are very small, and once installed, with extra 2500 pound ratchet straps securing it, no noise.Can fit into a dense hemlock with minimal trimming. Ladders are easily spotted by other hunters and are brutal to carry in. Climb ons make noise and cant be used on heavily limbed trees unless you cut them all down..
I'm not saying hang ons are better or safer. Not even close, just my preference for where I currently hunt.
They have to be checked every season, nuts tightened, straps replaced,cables checked,etc.
I must be safe climbing in and out of it. Sometimes I push the limit getting into one, and I will accept the consequences should I screw up in those instances. Dont take anything for granted, check everything multiple times.