I've 12 paladin levels, 2 monk levels, 1 fighter levels.

I'm done leveling paladin - with that in mind, would it be better to go 6 fighter (kensei) / 2 monk or 6 monk (ninja spy) / 2 fighter?

Any advice would be appreciated. I was originally thinking DoS II/Kensei I, but now I'm torn and thinking of going DoS II/NS I.

Thanks.