LogFAQs > #896568804

basically it's 3 5* CEs, 3 4* CEs, and 2 3* CEs.
they all vary in effect. of the 5*, Teacher and I is pretty clearly the best: 50% NP Boost + 300% star weight is better than 10% to all cards and usually better than the 3 turn Divine boost, though that can be situational. that said, do keep in mind that a 50% increase to NP can be found in a very common 3* craft essence so you are paying a lot for that 300% weight gain. the Divine boost is 80% damage + 40% resistance, so that could be good on a 4th-6th slot character so that when they show up, they wreck.

the 4* are all pretty decent. one pierces evasion and has extra damage, one has NP gain + star generation + minor regen, and the last boosts NP, crit, and charm. none of the increases are in any significant levels (12-15% respectively) but it's decent and, being 4* cards, won't cost as much AP as the 5* ones above.

on the 3* CEs, one of them is 1 attack evade + 5% HP increase + debuff rate increase by 3%. that has some value, technically it's a step up from another 3* CE that offers evasion. the other sucks (Prince of Slayer).

so long story short, 5* is specialized to divine or super expensive variant of a 3* card with star weight, 4* has the largest variance for usage, and 3* is generally inferior to either of those.

edit:
if it's not clear, star weight here means the chance of them getting the stars that were generated. it still is low on Berserkers but can be decent on some others like Scathach or Okita, who are fairly optimal for it. though the former may also work with the divine boost if you want an even better divine killer.
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