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I started to use RetroArch but now thinking of trying out Dig but there seems to be a LOT more info on configuring RetroArch and individual emulators than Dig. Am I missing it or once it's installed is it that simple?
Well they aren't the same. Dig is a front end. So for basic setup, you scan your collection on your device and tell it which emulators to launch games with. You sound a little more time if you need to fix up any misidentified games, or if they don't have the emulator you're using and you need to get the data to add it yourself (most other front ends don't allow this). But for basic setup it's really just step one scan, step two setup emulators. You can use Dig WITH retroarch emulators, for example.