Is it better to register directly with FXDD or through Gainscope?

Master, I visited the FXDD website using a VPN and it turns out I can register directly with FXDD. I also visited the Gainscope website and can register there as well.

I want to ask about the advantages and disadvantages of registering directly with FXDD or Gainscope? Is there a difference in spread/commission per lot if I register with Gainscope?