1. Ball powder fouls significantly more than extruded powder.
I have no opinion on this.
2. Ball powder meters so much better than extruded powder that I would only use ball powder for metered loads when I care about accuracy.
The metering differences are not enough to effect accuracy. Speaking in terms of rifles, good loads are tolerant to several 1/10ths fluctuations. Metering differences are not relevent, within reason.
Still happily answering to the call-sign Peetza.
You do not HAVE a soul. You ARE a soul. You HAVE a body.
He is no fool who gives what he can not keep to gain what he can not lose.
-Jim Eliott, paraphrasing Philip Henry.