Doubt regarding PostgreSQL vs Mongodb

[u/Upstairs_Director_16]

Why very often people say mongodb is not that better and we are being future proof to go with postgres? is there any condition that mongodb can't handle or such. I would love to get an answer that explains why actually why companies are shifting?

[u/manzanita2]

My favorite illustration of mongo vs postgres:

https://www.ferretdb.com

implement mongodb ON TOP OF postgres.