As paddy says - Seems no doubt that Tesla was innovative and brilliant, but both these guys made their names in a fledgling industry of enormous importance to human civilisation, where there were many others also trying to make their name as well.
Tesla has, in more recent years, become the darling of pop and comic culture, and all of that feeds into this idea of some sort of conspiracy.
The reality is that it is Teslas legacy that triumphed over Edison, since AC power transmission has been adopted as the method of choice over Edisons original DC power transmission program.
It is also documented that Edison got up to some pretty unpalatable tricks in order to smear AC as a viable system, even staging a publicity stunt around the execution of a murderer - which went wrong.
Wiki has a fascinating page on this background stuff -
http://en.wikipedia.org/wiki/War_of_Currents#Edison.27s_publicity_campaign