What it does
Klaviyo wins on segmentation when the data is clean. ElasticFunnels keeps it clean by sending events as they happen: Started Checkout, Completed Order, Refunded Order, Subscription Started, and any custom event you fire from a backend script.
Customers are upserted by email. Custom properties carry funnel ID, traffic source, click ID, and any quiz answers. Klaviyo flows can branch on every piece of EF context.