WelshPH - I've only ever seen them done with the bar across the chest, arms crossed with hands over the bar.
I've never seen the powerclean version, but I assume that's basically where you're simply holding the bar on your chest with your hands and squatting.
Just from picturing that and without ever having tried it, that seems much more awkward and less stable than the crossed arms version. Could you explain what you mean?
Thanks bro. Been wanting to try these so that's why I'm asking so much.