I think I understand what you are trying to say.
There are some differences between the tab builder and the file properties.
While they are both vessles to get values connected with properties the
files properties drop downs are not customizable. They have default driven
sub-values that are meant only to change the type of custom property.
The tab builder allows you to create your own drop down values.
when I use them I use the tab builder to always fill in my values. The only
time I resort back to the file properties is when I have configurations. It is
easier at that point to fill in the properties of the individual configs.
I hope this makes some sense.