Which is cheaper A) firestore B) MongoDb atlas with i) GAE or ii)AWS EC2 or iii) GKE for hosting our node.js server. -> a) 1M DAU b) 100k DAU

Question

According to firebase official documentation https://firebase.google.com/docs/firestore/billing-example ->a) For 10,000,000 app installs (1,000,000 Daily Active U