I like silver cars because dirt doesn't stand out (on them) as much (as cars of other colors).
この場合、色を強調したいから、cars that are silver の言い方も使えます。
I prefer cars that are silver because when they get dirty, it isn't as obivious.
この例文に、stand out は be obvious と同じように使えますが、ほかの場合使い方が変わりますから、気をつけてくださいね。