Memo boards come in several major types. The most common one people think of is the type of memo board you write on. These can be made of either chalkboard material or whiteboard material. If you tend to write many different notes, choose this style.
You can also find a set-in memo board that comes in more of a shadowbox style. These often have wooden shelves and compartments for uses like hanging keys, writing notes or even placing decorative items like small potted plants. If you like the versatility and organization of a memo board with shelving, choose this style.
Another common type is a push-pin memo board. These have a type of material, like cork or fabric, that allow you to fix items to them using push pins. If you tend to use memo boards to hang pre-written notes, photos or other paper items, choose a push-pin style.
Some memo boards are also magnetic, so you can use magnets to hang notes, photos or business cards, like you would on a fridge. If you don't like the idea of erasing a dirty chalkboard or having sharp pins on the wall, choose this option.
Another style you might see is the ribbon board. These often have crisscrossing ribbons that you place over photos and notes to hold those items in place. They're usually brightly colored and the ribbon gives a cute romantic look.
You can also find felt boards you attach letters to. These are great for retro or classic styles. They can also look good in artsy styles since they often come in bright shades.
Some styles might combine push-pin, draw-on and shelving styles. For instance, a style might have a drawing section on top and a push-pin board on the bottom. Or it might have a drawing section with a shelf at the bottom. Get these if you want the best of multiple styles.