Offence/defence hero: Prisca or Ameonna? Why?

I know Prisca has a better defence stat. I know Ameonna has a higher attack stat. What advice I wish to have from anyone is why one or the other is better at attack or at defence, even both. My problem is Ameonna has abysmal defence. Would it be worth using her on raids? Will she ever be a candidate for defence or am I delusional? Thanks in advance for your inputs!