Women: What's your favorite saddle?

Can I ask, how about these Brooks 'Imperial' saddles with that cutout in the middle?

Are they any good?

And something else: why are the ladies versions that are called 'S' and are shorter more suitable for 'ladies'? What is the advantage for women in a shorter saddle?
This cutout is something I can imagine that it makes a difference, but the length?

Women's versions traditionally were shorter to accommodate the wearing of a dress. Don't worry about length - width is more important.