Well, that will depend on the features you are looking for. If you want to automate your email marketing campaigns, which most marketers want, go for MailChimp. One unique thing about Constant Contact is its integration with great event management software, which most tools don’t have. MailChimp has great customer support, whereas Constant Contact has a faster and more dedicated support team. They also have several active and responsive contact options. Constant Contact lacks the free-forever plan, something which MailChimp has. It has a free plan for up to 2,000 contacts. The features are limited, though.