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I have seen a little of this in stack overflow but I am wondering if there is any reason to use the DB entity model and what the specific pros and cons of using on or the other are.
I have read the ndb is a little faster and that it helps with caching. They have a good bit of info in the docs but don't really straight out say that ndb is better. At least I haven't found that yet.
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App Engine NDB enables Python 2 apps to store and query data in Firestore in Datastore mode (Datastore) databases. Cloud NDB enables Python 2 and Python 3 apps to store and query data in the same databases and uses Datastore as the product that manages those databases.
The Google Datastore NDB Client Library allows App Engine Python apps to connect to Datastore. The NDB client library builds on the older DB Datastore library adding the following data store features: The StructuredProperty class, which allows entities to have nested structure.
An App Engine app is made up of a single application resource that consists of one or more services. Each service can be configured to use different runtimes and to operate with different performance settings. Within each service, you deploy versions of that service.
As far as I can tell ndb is an evolution of db, kept seperate to maintain compatability.
Have a look at the cheat sheet, it details the main differences
https://docs.google.com/document/d/1AefylbadN456_Z7BZOpZEXDq8cR8LYu7QgI7bt5V0Iw/mobilebasic
But it does not mention the other features such as computed properties.
If you are starting a new project I see no reason not to use ndb and every reason to.
EDIT: Alt link for document: https://docs.google.com/document/d/1AefylbadN456_Z7BZOpZEXDq8cR8LYu7QgI7bt5V0Iw/edit#
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