Dedicated GPS Devices with pre-loaded topographical maps have been the most reliable navigation tools in my person use. The Garmin Oregon 650 is my go-to GPS, however a Garmin Oregon 600 would function just as well as a navigation tool.
Tablets with GPS and mapping applications can be better suited for navigating longer distances where the larger screen comes in handy. There are numerous paid and free applications available for Android and Apple tablets. Back Country Navigator even integrates APRS into into its mapping app.
You will want a sturdy mount to hold your tablet in place while on trail. The Ram Mount X-Grip and Tough-Claw are the only mounts we have found that hold up to this type of abuse.