Nitocris or Nursery rhyme?

For the farming aspect nitocris is better overall since she can pretty easily get off 2 np's back to back and even 3 if you have a wavers as well, the only problem is that most of the team it relies on the insta-death gimmick.

Nursery rhyme already fails in the farming aspect and she isn't that useful out of farming, because even with crit stars and such she doesn't hit as hard as say a berserker.

I would go with nitocris for farming and general use probably nursery rhyme if you have a way to make crit stars

For farming, Nitocris is far superior, but only at higher skill levels. Her first skill charges her NP and her second (most important) skill increases her insta-death succes rate for 3 turns. For lower-level enemies like hands this actually gives her insta-death NP a pretty good success rate. If all you are looking for is a farmer, Nitocris is ideal.

Nitocris is the farming queen on JP because her NP has a good chance of inflicting AOE instant death. And she's pretty capable of clearing 2 waves by herself (with a starting NP gauge CE and sufficient level on her 1 & 2). While NR is an Arts crit servant who'll mostly be used against boss assassin boss fights (unless you have better Casters). Her NP is mostly used for stall and DEF down and it hits like a noodle : /
Since we don't have a need for offensive Casters right now, I'd say Nitocris should take prio. But you could just raise both since it's still half AP.

Nitocris. NR is fairly weak even with a setup.