Have you researched the topic from the announcement post?
You can view all Attributes on an instance at once, unlike a value object which only supports a single value and therefore you must look at each individually.
In terms of performance, the difference is mostly negligble with a few exceptions:
Attributes take up less memory on your device
Attributes are ~18x faster to create dynamically
Attributes are ~240x faster to delete
For the object values pros there’s still things only they can do like store instance object values which attributes cannot.