In 35mm, I use both. The black body had an advantage over the chrome body in two situations:
1. When attempting to shoot reluctant subjects inconspicuously, the black body draws less attention than the shiny chrome body.
2. When shooting small subjects on or under glass, the reflection of the black body in the glass is less than that of the chrome body.
On one hand, I personally prefer the appearance of the black body; on the other hand, I prefer the way the chrome body withstands everyday wear and tear.