Choosing Database for my MVP

I want to try an idea and want to push MVP but don't want to spend much initially. After the MVP is launched I want to spend $ and efforts on getting clients and then enhancing tech.

For database point of view. I am thinking of starting it with MySQL database Since I already have shared hosting which I was using for some development purpose. Later I can plan and switch to Postgresql.

I want to know the thought of experts before deciding. Thank you.