If you look closely at the above 2 pics, you will note they are exactly the same PC board.
Of course, Hercules goes with the blue board and heat sinks on the ram chips, with a different fan.
Basically, no matter whose R300 based board you get, you have the same board. ATI has incorporated the video DAC's into the R300 (400Mhz) so video display quality cannot be effected by whatever company builds one.
Also note: Anyone considering this card will also need to think about upgrading the power supply in your computer. The card draws around 55Watts of power, so if you have a high end system with a 400W supply, you may want to think about upping it.
Of course, more power means more heat. Cooling will be critical. Just some stuff to think about.