The brightest planet is Venus as its clouds reflect the light which makes it look like a star
Venus is the brightest.
I believe Saturn is the brightest because it's one of the largest - also it has the big ring around it. As for the planet being the brightest in the sky when viewing from earth, that would be the planet closest to earth depending on where it is on its ellipse.
Venus is the brightest at night !
Venus is the answer