Distortion correction involves playing with the pixels in the corners, resulting in softer images where the image isn't very sharp to start with. Some processes attempt to compensate for that loss of sharpness by increasing the Acutance
, which is the digital version of Unsharp Masking
If all you'll ever do is display reduced resolution versions of your images online, then none of this matters. But if you want to make prints, you'll be disappointed with the results.