Exactly they both have scenarios that they work very well for just like you have with the server-side SQL RDBMS and the NoSQL ones. IndexedDB is fine for simple

Exactly they both have scenarios that they work very well for just like you have with the server-side SQL RDBMS and the NoSQL ones. IndexedDB is fine for simpler apps or apps where there isn't a real need for joining, grouping and ordering the records in a very flexible way. Web SQL is definitely dead in native Chrome apps. It was never born actually given IndexedDB was the only solution that was pushed.