The key difference between the get() method and load() method is that load() method will throw an exception if an object with id passed to them is not found, but get() method will return null.
The second important difference is that load() method can return proxy without hitting the database unless required (when you access any attribute other than id) but the get() method always go to the database, so sometimes using the load() method can be faster than the get() method.
Note: Use the load() method, if you know the object exists, and get() method if you are not sure about the object's existence.
