Desktop presets will work only on the desktop version of Lightroom. Mobile presets will work only on the free Lightroom mobile app. The mobile and desktop presets are similar, but are slightly different as they are created differently. If you want complete control when editing photos then desktop presets are great, however if you prefer to edit quickly on your phone the mobile presets are likely better for you.
Please note that the mobile presets are not compatible with the desktop version of Lightroom, just as our desktop presets are not compatible with mobile.