Logo churn counts cancellations by customer, not by dollar. A company can have low logo churn and high revenue churn (a few large accounts canceled) or high logo churn and low revenue churn (many small accounts churned, big ones stayed). Both versions matter and tell different stories.
Logo churn is most informative for product-fit conversations: if many small accounts are churning, the product isn't sticky for them. Revenue churn is more informative for business-model conversations.