Sure, in theory, 1password MIGHT have better private auditing and review. But there's no reason to believe they do. To the contrary, when asked about open sourcing 1password, one of their developers explained that they don't do formal code review because it's too expensive, and that none of the external experts they consulted with have ever performed a full review.
https://discussions.agilebits.com/discussion/22686/open-sour...