Decide whether you need an additional sound barrier in your home. Wall texture absorbs sound and is great in rooms with tall ceilings and carpet-free floors.
Understand that heavy textures are not easy to remove and will limit what you will be able to do with your wall. You cannot apply vinyl lettering or graphics on rough-textured walls. Wallpaper must first have a wallpaper liner applied. Faux finishes will generally be limited to glazes or washes.
Look at different samples from different drywall and faux finish artists. Each artists will preform the finish differently. One person's orange peel finish may have more texture than another person's applying the same named finish.
Ask to view homes that drywall or faux finish artists have completed if you're considering letting them do the work. While samples are great to visually see, often the full effect of a texture on a finished surface allows you to visually understand what the texture will look like in your home.