Brazilian Ju-Jitsu the best?

So here's an issue I've been debating with many folks about and wanted to see what your opinion is. I always hear this phrase "Brazilian Ju-Jitsu is the BEST" Is Brazilian Ju-Jitsu truly the best system? Is it the best system because of the introduction of Mixed Martial Arts/Cage Fighting? Or is Brazilian Ju-Jitsu like Japense Ju-Jitsu and Judo are merely good systems which derived from the same original system?



Any opinions?