So i went through all 4 gang options in 4 different saves, even though there isn't any contents for the 4 gangs yet, i can conclude that the Chinese & Russian are the better choices out of the 4 IF you care about Lucy's mental state based on her reaction upon hearing you're in what gang.
Joining Warren/your dad will results in Lucy being sad & depress, she may looks happy on the surface but she sounds miserable whenever Warren talks to her.
Joining Hornet will results in Lucy being angry at the MC, she opposed the idea of the MC being an underling of Nesrot.
Joining either the Chinese or the Russian will result in a neutral reaction for Lucy, she doesn't seems to mind you working for either 1 of them as long as they aren't Warren or Nesrot.