I really like how easy it was for me as someone who has never used any of these types of software before, to learn their system.
Also with all 3 platforms they have free trials which allowed us t try them out first hand without having to pay anything up front or risk being charged monthly if we decided not use then after our trial period ended! It's nice that each one gives some type of discount depending upon your level in training (and also amount paid). Each program had different strengths but what made my favorite by far were Mailchimp & Infusionsoft. Both are great at sending bulk emails so once i got those down there wasn't much else holding back other things such as scheduling etc..