Hi @DStrickland!
Attentive doesn’t have a back-end integration to send information from Klaviyo to Attentive, so if you are collecting emails and SMS numbers in Klaviyo, you have to set up a custom dev to pass that information back into Attentive. Because of this, we’ve found it easier to use Attentive to collect both email and SMS for clients who prefer Attentive SMS.
The Klaviyo forms offer almost all the same functionality (except the full landing page form I believe). Of course in a perfect world I would use the Klavyio form to capture all information, because you can split out email and SMS in flows very easily. Hope that helps!