Both bet on semantics, in different places
Omni and CoWork share a premise: AI answers are only trustworthy when they are grounded in shared business definitions. Omni builds that model inside the BI tool, where it backs dashboards, SQL workflows, workbooks, and AI chat. Snowflake builds it into the warehouse as semantic views, which define the metrics, entities, and relationships that CoWork's agents consult through Cortex Analyst before they write SQL.
That placement drives most of the tradeoffs. A model in Omni is used by every surface in the product, and it belongs to the BI layer rather than to the warehouse underneath. A model in Snowflake sits beside the data and inherits Snowflake roles and row-level security, and the agents behind CoWork can also be called from your own apps through the Cortex Agents REST API.