For example, Laezel only wants to find githyanki creche, but Laezel isn't nagging and whining too much when you do other quests, she only occasionaly reminds you that you are wasting time from her point of view, while Shadowheart is constantly giving advices and directions and is visibly annoyed when you ignore her.
What? I'm pretty sure you lose Rep with Lae'zel by doing anything that doesn't involve murderhoboing or telling people to piss off. She's just as much of a pain in being anti-content as Shadowheart. The only difference is Lae'zel is more interesting. The sniping about noses was great and was pretty endearing.