Which privacy currency do you think is the best and why?

Explaining why you choose one over the others, will help others understand the purpose en possibilities of privacy coins better. Please no hostilities and childish remarks about other coins. All the top coins in this segment are well made, but differ in some aspects. Let us learn from eachother and not bash other projects just for personal gain.

I'm no expert and my choices may be flawed in some cases, forgive my ignorance if you think one project, doesn't belong in this poll or when i have not mentioned a project which deserves to be listed.