what is the difference between Ordered-deny-overrides and Deny-overrides

[smith jack <thinke365@gmail.com>]

though i have read that specification. i am still confused.
There is little difference, as the specfication said: when envaluated,
the order should follow the order how policies listed in policyset.
but will this matter?
if one Rule return Deny, they both will Deny.
(So the only difference is that, Deny-overrides is much more flexible
than Ordered-deny-overrides, right? since envaluated in random order,
may fail much faster, and will gain
better performace, is this opinion correct? if not, it will be
appreciate that you point the fault, and tell how to correct it)
thank you:)