Our (GE) checklist states the option:
“Land using Flap 30 (if performance allows)“
For the Engine Inoperative case you are only choosing between F20/F30. My understanding is that if runway length/brake temps permits, F20 is the preference (for possible Go Around). If you don't like F20, select the F30 option on the Engine Fail checklist, then re-direct to the Over-Weight Landing checklist which will direct F25 on account of the Vref.
Hope this helps.