Below is a video of Dustin Denes showing what is essentially a rear naked choke that is assisted by grabbing your own gi. Ignoring the obviously quirky personality of the instructor, to me this is another reminder that the possibility of creative chokes from the back are endless.
Still, for me, I’m convinced that some chokes work better than others. I believe in the jiu-jitsu fundamentals we learn from day one. To me, in this position, the two basic chokes are: the standard gi choke from the back and the bow-and-arrow choke. These are the one I focus on.