I think they are both capable agents.

Both good, but Ziva rocks!!She's former mossad - she kicks butt!!

First of all it's spelled massad no mossad and second Ziva's accent makes her sound better and she actually knows the tricks of the trade, Kate doesn't.

I couldn't decide i like them the same, Kate has less so i picked her but Kate risked her life for the team when there was a shooter in twilight........ but i know ziva would do the same.... it's a tie