Following is a quick comparison of the 2 scanners I own. First image below is from the built-in unit of my NX420 AIO, the second one is from Epson V330, a dedicated scanning unit.
NX420 AIO

Nx420 was connected to my PC via a standard USB2.0 hub. Scan was initiated by choosing the menu option in the AIO unit.
Scanning took close to a minute (this was the first scan).
The “Emirates” part of the boarding pass came out in a different color (kinda washed out too).
Epson Perfection V330

V330 was connected via a standard USB2.0 hub. Scan was initiated by using the front button on the scanner.
Scanning took less than 5 seconds (this was the first scan). The scanned image looked pretty close to the original (brown color reproduction was excellent).
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