Kodokan judo is the original form of judo created by Kano Jigoro in 1882. Kano designed Kodokan to be practiced for self-defense, mental and physical benefits, and in a sports form. Or in other words, all judo styles are recognized and rooted in “Kodokan Judo.”
Sambo is much better than BJJ when it comes to preparing you to become a complete fighter. Sambo will teach you how to fight both on the ground and standing up using strikes, whereas BJJ only prepares you to fight on the ground without any striking.
Training in Judo improves one’s understanding of handling street fighting situations more than the average person on the street. This is because training in Judo will allow them to subdue their attacker or help them get back to their feet to make an escape to avoid a worse situation.
Combat Jiu-Jitsu(CJJ) is a hybrid version of Brazilian Jiu-Jitsu that was primarily developed by Eddie Bravo to make Jiu-Jitsu matches closer to reality-based like Mixed Martial Arts(MMA). CJJ incorporates Jiu-Jitsu techniques with open palm strikes to make Jiu-Jitsu matches much more realistic.
The Judo syllabus teaches submissions, including choke-holds(without neck cranking) and joint locks. However, most people won’t notice there are submissions because Judo’s primary emphasis is on techniques that involve throwing your opponent to the ground to win the match.
The crucial difference between Judo and Sambo is that Judo was designed to be practiced for self-defense, mental and physical benefits, and as a sport for everyone. Conversely, Sambo was designed exclusively for the Russian military to prepare for brutal hand-to-hand combat situations.