QuarkXpress vs. InDesign?

I want to place one of these programs on my resume in order to get a job as a copyeditor. I have used QuarkXpress (but forgotten how to use it) in the past, for a college magazine and now want to learn InDesign. So should I sharpen my skills in QuarkXpress or just go straight in to InDesign? Which one is being used more widely among copyeditors or anyone in the publishing business?