The difference between card stock finishes depends on two values, contrast, and paper surface. Contrast refers to the ability of a paper to record a range of tones from the most extreme white to the richest black. Nearly all photographs will have a full range of tones, but depending on the type of paper you use one can either highlight the differences (with a high-contrast paper) or subdue them (with lower-contrast) depending on your preference and purpose. The paper’s surface is based on the level of reflectiveness and, again, is a matter of preference.Glossy finishes are printed on coated paper with a very smooth, shiny reflective surface. Glossy finishes has a high-contrast appearance and look slick to the touch when not under glass.
In contrast, matte finishes have a very smooth, non-glare finish. Matte finishes have a lower-contrast when printed and are often used to enhance the texture of a print.
One thing you might consider whether you need Glossy or Matte finishes is whether you need to write on your postcard or business card. If you need to write on them, go for Matte. Glossy also can take a beating with rain or sun exposure.
Are you ready? I am ready for business card printing.