Braiding, weaving, knots, making different ... hand crafted stuff.... from borrowed or self invented ideas, this hobbies and interests is just so much greater for us who are also slingers. For us it is pure fun to spend more than a few minutes on a ... project ... like a sling. And we can use (or trade) what we make instead of just stuff it in a drawer.
People with no interest in hand crafted artsy cordage stuff, like curious_aardwaark and Aussie, can make and use simpler but perfectly usefull slings without the slightest worry whatsoever.
What is best is usually what one is us used to, anyway.
I usually use braided slings. I began making and using them long ago, they feel comfortablr to me, I can aim with them pretty well, and I get instantly annoyed when thin cords tangle, which happen when I use a
un-braided sling, which I in fact still sometimes make.
Like the seat belt slings I use for snow balls and a small leather pouch with wery thin poly cords for golf ball distance throwing, because it seem like the natural choice.
Wery thin cords = leather finger loop, no reason not to listen to curious_aardvark

timann