It depends on your use-case. On a higher-level OpenMeter focuses on the data challenge to collecting usage data from infrastructure components on scale, and providing aggregated meters real-time. The other platforms you mentioned focuses more on billing with some metering component. For example Lago looks like writes all events to a relational database first than aggregates usage at query time when they do billing. Metering with a database has some limitation when it comes to scale or when you need to monitor meteres real-time and trigger actions based on them. I can see for example some combining OpenMeter with other billing platforms to have a scalable usage-based billing.