It is your choice.Both will work same.
The plus point of Kodular is that it works with blocks but Android Studio works by coding.But Kodular also uses Kawa(I am not sure) which runs on Java.
It will be great if you update your app and your knowledge.Using various things helps you to decide best for you.
If you are thinking to change Database then my suggestion will be MySQL.It works great and is easy to use and manage.If you want to use that then you will need:
- A server
- A php script
For server you can try https://www.000webhost.com/
And for Php script use this:
App Inventor Tutorials and Examples: MySQL | Pura Vida Apps