By "better than pcaps," what they mean is that this is forensic data from a machine - proof that can show what happened on A machine (but presumably others - that the "widescale" problem - you'd have to show how wide the tampering is, but of course that data is being destroyed in real time right now, nationally).

The pcaps are just the capture of real-time data packets from the machines to the outside world that contain data about election tabulation, and thus, changes. The trick is going to be proving the data source of the pcap is legitimate. That's going to be the big thing that proves the manipulation was nationwide, coordinated, and largely in real-time... Hope they can prove the source of the capture is impeccable.