1. Triangle choke
In some instances, the triangle/armbar combination is the #1 submission in term of high probability finishes. But even so, the emphasis is on the triangle part of that combo, which sets up the armbar.
2. Chokes from the Back/Rear Mount
Gi or no gi, back or rear mount is without a doubt the most dominant position in jiu jitsu/grappling. And insofar as chokes are the most efficient submission, chokes from the back are understandably high probability.
3. Kimura
The Mendes brothers have referred to the kimura lock as one of the most important holds in jiu jitsu. The kimura is also a favorite of Japanese MMA superstar Sakuraba. Versatile, and a great controlling hold as well as a finishing hold, the kimura has all of the advantages of the armbar without any of the armbar's liabilities.
