How do the E-War capabilities of the Vanguard Sentinel compare to other ships which are supposed to have them, like the Herald?

The Sentinel is intended as something of a 'trickster' ship, oriented towards causing confusion on the battlefield. From EMP pulses to command and control interference, the Vanguard Sentinel will support battlefield operations by making it all that much harder for opponents to stay in contact and have proper information. The Herald, on the other hand, is built around a different goal: intercepting and relaying valuable transmissions and other data. Both ships have some ability to do the others' role, but they will likely find success in different places!