Edison was a better salesman
From Wired today: Jan. 4, 1903: Edison Fries an Elephant to Prove His Point
Edison had established direct current at the standard for electricity distribution and was living large off the patent royalties, royalties he was in no mood to lose when George Westinghouse and Nicola Tesla showed up with alternating current.
The lesson here? Doesn’t matter if you’re technology is better – you need to know how to sell it.