underside paint choice

I'm at the stage on my 69 Valiant to start laying paint. I have it on a rotisserie and it will be W1 White. I have the bottom all prepped and sanded with 400 grit. My plan was to paint the bottom black but the more I look at it I'm considering painting it the White except for the wheel wells which will be black (due to up keep) What would you I do