Mongodb and dynamodb are completely different dbs. One is unlimited scale KV but very expensive , another is document nosql db that sells you idea “it just work

Mongodb and dynamodb are completely different dbs. One is unlimited scale KV but very expensive , another is document nosql db that sells you idea “it just works” for lots of features , indexes on anything , aggregation , time series . Vector DB, sharding , replicas etc . It’s a very powerful db for sure.