User blog:NickNig/Mariudeth Leaderskill Question

First of all, sorry about bad english, english isn't my first language.

My question is that the leader skill of Mariudeth and Zebra are they the same? So they buff crit hit with the same amount? And is it a better choice to pick Mariudeth? I got both of them, but unfotunatelly my Zebra is Oracle which I feel won't fit really well to a crit team, and Zebra is just too rare that I don't want to spent another month and farm another type again.

Another concern is the BB skill, eventhough the BB of Mariudeth increase crit chance, but as I got SGX (Which I believe increase the crit chance the most among all unit and cannot be stacked) and Maridueth BB skill is single enemy, is it better to choose Zebra in this case? I am struggle between which unit should I level up, can anybody give me some advice?