Archiving MM_EKKO or MM_EBAN what business reason to determine value

Hello,

We would like to get business reasons under which we would opt for the one step or two step approach in pre processing option of selection screen in archiving objetcs MM_EKKO and MM_EBAN.

We are leaning towards one step but would like to valuate the advantages / disadvantages and business circumstances under which each is applicable.

Thank You,

Satyajit deb