Lightdash keeps dbt as the single source
For a team weighing Omni, the strongest argument for Lightdash is that it adds no new place to define logic. Metrics, dimensions, and descriptions are YAML in the dbt project; Lightdash reads them and builds explores, dashboards, and a metrics catalog on top. Every change goes through the same Git review as the transformations, with automated validation and preview environments, so the BI layer cannot quietly drift from the models.
The open-source core is the other difference Omni cannot match. You can read the code or deploy it on your own servers, and if that sounds like a chore, Cloud Pro takes it over for $3,000 a month with no cap on users. The tradeoff is a narrower business-user surface: people explore what dbt exposes, and new metrics wait for a YAML change.