What is the strongest kyber crystal?

As a cryptocurrency and finance expert, I'm intrigued by the concept of kyber crystals, which are often referenced in popular culture as a powerful and mysterious energy source. But, given the fact that kyber crystals are purely fictional and exist only in the realm of storytelling, I'm curious to know - if we were to speculate based on the lore surrounding them - what would be considered the strongest kyber crystal? Is it the one that emits the brightest light, or perhaps the one that harnesses the most raw power? Could it be a rare variant with unique properties, or simply the largest crystal in existence? The question is intriguing, and I'm eager to hear your thoughts on what might constitute the strongest kyber crystal, based on the information we have available from various fictional sources.