the experience list is saying what gives you the most EXP per charisma for that particular class. for example
Bandit: Remnant Vanquish 1
means that doing commission sorties on remnant vanquish 1 gives you the BEST set of units for combining with any bandits you have(eunice or mortimer are silver bandits you probably have). this is because if you combine units with the SAME class you get bonus EXP. aka if you have an iron soldier and an iron bandit with the same level, the iron bandit will give eunice more EXP.
and Prince(You): Dragon Hunting/Immortal Beast, is because it gives your account the most EXP per cha.