The big difference here is that Portal is optimized for drag-and-drop file transfers, even those larger than 1 GB in size. And if your phone or tablet is running Android 5.0 or better, you can save PC files on an SD card in your mobile device.
I particularly like how Portal integrates with the file explorer app in Android. It appears like a mounted drive so you can easily see what files or folders you've transferred. They'll also appear in the Recent folder of your Android device.
Portal also works with Google Android's intents system, so you can share files, images and more directly to any other third party app or through email. Any pictures you transfer through Portal will also automatically be added to the Gallery app on your Android phone or tablet.