Originally Posted by kgphoto
What is the benefit of either of these techniques?
The "final" layer? As I understand it, you can do further modifications on this final layer without having to tweak the underlying layers. For example, if you worked on Model A and came back a year later with some desired modifications, you could begin working from the final layer. The book hints that I will learn more about this layer in the proceeding chapters. Perhaps Natalia can provide additional input?
The "pen" tool? From my quick understanding, it can be a superior way to define or select a shape. It is more precise and and it is scalable. By scalable, I mean that if you define a shape, it is a vector, so it can be easily scaled up or down.
The website hinted that if you are trying to select an object where the contrast is weak, PS might have difficulty. But using the pen tool, it should be quick and accurate.
I am not sure I provided good answers. Perhaps Natalia or others can jump in.