Elements support TWAIN and WIA scanning protocols from inside the applications - though some drivers do have bugs/issues.
Personally, I do all my scanning in the background with the stand-alone scanner software. All TWAIN really does is call that software, so there’s no quality difference, plus you’re not locking Photoshop Elements up just to doing scanning. You can retouch and edit images in Elements while you scan in the background – which I find is far more efficient. And you avoid the issues associated with drivers, etc.