Bci Which Buy?

Good morning everyone. I hope you are well.

I’m here because I would like to buy a headset to connect it with Grasshopper’s plug-ins.
I’m undecided whether to buy the Neurosky Mindwave or Epoc Emotiv (they are cheap)

Which of the two? Or do you know of others I can get to interact with Rhino?

Thank you all. A hug, Antonella.