The samurai are glorious. I hate 15mm because I'll never be able to paint that scale, let alone this well. I'm afraid they got my vote.
The Germans are pure pulpy goodness. The choice of the two helmeted/gasmasked soldiers to accompany the robots is perfect. That said, the paintjobs of the robots somehow don't mesh with the Germans, for me. I think it would have been better had the robots been painted in a similar color to the Germans, as if the robots were just another version of a tank, in tank camoflage colors. Also, I have an item of advice that will help you in your painting from now on: Do not glue rocks onto the top of your base materials. Rocks never float on top of everything else. Rather, they are embedded in the surface muck. I suggest glueing the rocks on first, and then building up the rest of the base around the rocks.