Hi,and welcome!!
Well,more a matter of what you prefer,I have made the apache style sling(when you sew on a leather pouch) but actually prefer the braided split pouch.
of course, are advantages with a pouch since the stone/ball doesnīt fall out as easy.
Experiment,that is my best advice,have made dozens of sling variations but the one I made just now is the first one I really am satisfied with.
I prefer it when the sling is so long that it almost touches the sling,have found out canīt handle a noteably shorter sling than that.With this length I am actually gotten quite accurate!
Good luck,have fun & be safe