Aweber vs Constant Contact vs Campaign Monitor vs MailChimp

So I constantly get customers asking me about these particular competitors.  Truthfully, I don't send out email campaigns for Ethode. But, after 17 years of working with clients and see how they use these systems we've been able to witness many pros and cons for each system.  Not only that we've been able to see first hand what you can do with each that perhaps you didn't realize you could.

This is a long post... Sorry, but when choosing a system you might use for the next 10 years why be brief?