If the data transfer speed of the serial port is more than 8 times faster than the parallel port then...
Although in a closed loop, tightly controlled artificial environment the Amiga serial Theoretical Throughput is 115,200, one cannot forget the parity, stop bits and handshake requirements of the Amiga serial port which give it a maximum usable speed of about 57,600 bits per second vs the standard parallel port of 12,000,000 bits per sec (12,000 kbits per second). The add-on Zorro cards were capable of more speed, but only a Silver Surfer Clockport adapter and Surf Squirrel were really available for the A1200. The parallel port had 4 additional lines for control/handshaking and does not use the data lines for this purpose. Hence, Darrin, if you divide 12,000,000 by 57,000 you end up with a wee bit more that an "8 times increase.". If one uses a faster processor and or a better serial port and parallel port card, you would in theory be pitted against a EPP port that can transfer at 2 Mbps.
Again, I'm real bad with math; anyone got a calculator?