Budget-wise, Mailchimp is clearly more affordable at roughly a 1.5x price difference.
Cost modeling varies: tiered drives Mailchimp pricing, while SparkPost (Bird) uses flat-rate.
Both tools have compelling strengths — choose Mailchimp if you value all-in-one, otherwise SparkPost (Bird) offers advantages in high-volume.
Both tools have compelling strengths — choose Mailchimp if you value all-in-one, otherwise SparkPost (Bird) offers advantages in high-volume.