Atleast IMO from the general public Sambo San Shou/Sanda I have had opportunities to train with people of both arts. They are both excellent. Sambo has great wrestling and obviously leglocks. Sanda is very similar to Muay Thai with explosive take downs. Both are great supplements to almost any martial art especially BJJ. I'm looking for a gym with either as we speak What do you guys think are underestimated Martial Arts?