Your question about Judo vs Sambo, is like asking "Which one will win between Greco-roman vs Freestyle".
Besides some minor detail, they're almost the same. Sambo is Russian Judo. Except sambo does leg locks, while Judo practitioners are good at throwing from the upperbody, while sambo are good at leg tackles.
Tell me if you figure it out which one is better between Greco-roman and freestyle. If you do, you could probably answer this question as well.