I was asked at the GDC several times how Photon differentiates from competition (SmartFox was most mentioned, Electro Server second) so here is an quick overview table:

Photon and Competition
Although this is just a very basic overview it already shows the advantages of Photon: (reliable) UDP, C++ server, extensible in C#, support of any data types.
Tags: Development
ElectroServer supports HTTP as well as all data types. The latter is with its binary protocol which is AS3-only due to the necessary support on the Flash side.
Hi Peter, thanks for the hint. I will change that asap! Best, Robert
Smartfox supports HTTP as well with the BlueBox add-on.