DJAY supports over 7000 devices for Android - needless to say the performance of audio and MIDI can vary a lot with such a vast number of hardware which do not follow one standard as for example Apple devices do.
In our experience all Nexus devices with a minimum of Android 5.0 had the best performance results. Some features as Keylock and Time-Stretching require devices with quad-core processors.
Also, its known that there are issues especially with Sony Android devices (distortion). Its some sort of hardware incompatibility, as each hardware manufacturer handles audio protocols differently.
That's why we cannot guarantee all Android hardware to be compatible. We do recommend Nexus devices which work reliable on Android platform with djay.