Ask HN: Meeting with acquirer / competitor. How much tech to disclose?

I'm CTO of a startup. Hoping to find a few people who have been around this block.

We're worth around $20M at the moment, vs our competitor's worth of around $100M. They're ahead of us in some ways, but we beat them on others (including some of our analytics). They've expressed interest in acquiring us, and we're giving it fair consideration.

We have a getting-to-know-you meeting in a couple of weeks from now. How much tech detail should I extend? We have NDAs on both sides, but obviously (at least to me) those are worthless in terms of protecting us from them implementing disclosed ideas. CEO (who is non technical) isn't as concerned.