1. Clean interface; it corrects some UI flaws of other apps (the ability to confirm your password for a new image being encoded, the ability to visualize the password as it is being entered), and provides the ability to hide text AND small files, even at the same time (for example, a large image containing both text and a small image).
2. In my brief experience, I have nothing to complain about Pictonigma, and everything to thank for.It is very good, however the recipient phone is monitored.
3. In my opinion, this is the very best Steganography app for Android.