Marketing Automation
Lifecycle and behavioural email.
Lifecycle email is a data problem wearing an email interface. The question is not which editor you prefer, it is whether events from your product can reach the tool and become a trigger without an engineer in the loop every time. ActiveCampaign approaches that from the marketing side, Customer.io and Userlist from the product side.
Editor's pick
If your triggers come from what people do inside the product, start with Customer.io or Userlist. ActiveCampaign fits better when the sequence hangs off a sales pipeline.