See [1] (from 1:14:43). The difference was Binney's system (ThinThread) being designed to quickly filter out most data and retain only a relatively small amount of targeted data. The result being the target had to be specified before the data could be collected. The other system (Trailblazer) was designed to capture and retain as much data as possible, and allow targeting to occur against this enormous buffer after the data had been captured.

[1] https://media.ccc.de/v/29c3-5338-en-enemies_of_the_state_h26...