MI A2 Lite has 32GB of storage and the A2 64GB.
Both have the OCta Core Processor Lite with 2GHZ and the A2 with 2.2GHZ
Lite has a 5.53" screen A2 with 5.99"
Both have a 12MP front camera and the Lite with a 5MP on the back and 20 MP on the A2 back camera
Lite has a 4000mAh batter and 3010mAh on the A2
Both have finger print readers
both with 8.1 Android OS
Audio back on the Lite is a 3.5mm and the USB Type C for the A2
Graphics is the Andreno 506 for the Lite and the 512 on the A2
Lite has 3 GB of Ram and the A2 has 4GB
Lite is a bit thicker 8.7mm and the A2 is 7.3
It really depends on what type of software you are going to run the device. If you are going to run intensive software I would get the A2 if not the Lite will work fine. I hope that helps. Thanks for the question.