Which is the world largest cru?

Could you please elaborate on the question you're asking? It seems you're inquiring about the largest cruise ship in the world, but the acronym 'cru' isn't commonly used in this context. Assuming you're referring to cruise ships, the largest one currently in operation is a topic of interest in the cruise industry. There are several contenders for this title, as cruise companies continually strive to build larger and more luxurious vessels. Are you looking for information about a specific ship or the general trend towards larger cruise ships? If you're interested in the current record holder, it's worth noting that this can change over time as new ships are launched.