Being relative new to mobile app development. Please, I will like experts to share their view on which is better to go with between using firebase or connecting to mysql as the database for either small or large scale mobile project in the below aspects (1) if the app does not connect to an existing database or third party platform to share the same data (2) if there is a database for the app already ( assuming I am connecting the app to a web site to sharing the same data:something like how Facebook app). Thank you