Summary:
1) Summoner - not worth /no reason farming at all.
2) Road to Demon Den - 10% phyllis, if you need silver soldiers. or a mincosted Phyllis. At 50 charisma/1 stamina, horrible map.
3) Underground Holy Fountain - 50C/3S, potentially decent place to farm silver/gold/plat fairies outside of fairy farming daily. (Only applicable if you want the chance of silver and forgo the rubys from Phalanx 2)
4) Underground Holy Fountain X 60C/5S - better quality fairies, but pretty much no reason to farm this one considering the high cost, unless black fairy (15%). but fairy daily probably better overall.
5) Tomb of Darkness 50C/3S - Daniela & Leeanne, silver farming if necessary.
6) Tomb of Darkness X 60C/5S - aff farming map, but not as good as Phalanx 2.
7) Tsuyooni 50C/3S - Only for Elaine, only for Elaine.
8) Tsuyooni X 60C/5S - Male aff items. You must not be serious if you're farming this after we had Heir to Strategist not long ago.
9 & 10) Destiny Road (non-X and X) - Horrible maps, Monday daily way better. and you shouldnt really be needing to farm this for the plat armor, there should be more important stuff to farm. (and if gold, there are better ways)
11) Infernal Beast - 50C/3S - Harissa & Eunice with a chance for plat armor. obviously way better than above.
12) Infernal Beast X - yeah if you can clear this map there's obviously nothing to farm here.