the color is only the difference . forkdelta is a kind of reddish ( if im not mistakin) while etherdelta has a blackish theme .
oh i see . maybe you only have a slow internet connection , thats why you need a vpn to fasten up your internet so that you can now access heavy sites like etherdelta . while for me i can access etherdelta without any problems but i like forkdelta the most as it is light and easy to access .
for me i notice , that some coins are missing on ed while you can find them on fd , other times , you cant find your coin on fd but you can find them on ed . so for me both have pro's and con's .