Do not compare every tool as if it solves the same problem
Attentive is strong when SMS is the center of the retention program. If your team is not ready to use SMS seriously, you may be buying a lot of platform for a small part of your actual workflow.
For email-first teams, compare Sequenzy, Klaviyo, and Omnisend first. For SMS-first Shopify teams, compare Attentive and Postscript. For enterprise retail data, compare Listrak, Bluecore, and Bloomreach.