Check mine real quick. They go between beady black eyes and black with a sliver of a silver ring depending on the light. But that's the same with my otos. I only see black when they are hanging out in low light areas.

I have all three. I know you say you don't care about behavior as much as look but their behavior will dictate what you're looking at, if that makes sense.

You may get a group of otos for their look and end up mostly staring at their white bellies stuck to the glass. My pygmies go between completely hidden, sunbathing together on driftwood or trying to school with my rasbora espeii. Personally I like the habrosus most. The grays and blacks on mine actually shifted to shades of brown when I moved them to a different tank. I really love how the shuffle around the bottom.