Hey; when everyone is doing circles, you got to diversify
But we did the triangles to avoid confusion with other airforces, after some nasty mistakes were made, thinking Dutch planes were Japanese (by the British) or British (by the Germans). As at that point we were still firmly believing we'd again be neutral the second time around.
Also, if I recall correctly; on aircraft, the triangle was always painted on pointing down. Which makes more sense, since that's the way most of our planes went anyway...

The M36's are looking really spiffy though!

I still need one for my own 28mm Dutch forces myself. I first thought they were the 1/56 May '40 vehicles that were only made in limited numbers, but they're in (approximately?) 1/72 instead...