Postgres jsonb vs composite type performance differences

What considerations are involved in choosing between a jsonb column and a composite type column of the same structure? For example, consider a column like that used in the Postgres documentation: CREATE TYPE inventory_item AS ( name text, supplier_id integer, price numeric ); What are the tradeoffs involved between this approach vs a jsonb column mirroring this structure? For example, I suspect that the composite type won't require storing the key names for every record, whereas the jsonb type would require this.