Most of my stands are 20' to the platform or a bit more. I usually use a 20' climbing stick and the stand is one step further than the top of the stick if I can get it set the way I want. I have a couple of 16' stands but I don't feel as confident. Over the years I've proven in my own mind that you can make a lot more mistakes in movement and also errant scents if you're way up high. I like the extra forgiveness that height allows me.
But like I said - that would also be with a safety harness on.