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Are you asking for a comparison of the two?

Lojban is a language based on the principles of logic, which has a goal to have a completely regular and unambiguous syntax. It also gives people a great amount of freedom in how they express themselves, for instance by not forcing them to specify such things as number, gender or tense (for instance, the sentence "mi viska do" can mean "I see you(singular) right now", "We will see you(singular) in the future", "I have seen you(plural) in the past", "It is always true that we can see you(plural)", and so forth).

Another goal of Lojban is cultural neutrality (for instance, while Esperanto's vocabulary is based primarily on European languages (making it much easier for the average European to learn than the average Chinese person), Lojban's vocabulary is based on the six most widely used languages in the world, so that people from completely different background can have an equally difficult time learning the language), and it's designed to be easy to pronounce (whether or not that goal has been met is a matter of some debate).

Klingon's goals are slightly less lofty. While Lojban has its roots in a language that was created for scientific study (Loglan), Klingon was originally constructed for the purpose of translating a few lines from some of the earlier Star Trek films.

Now, while Lojban is designed to be easy to pronounce, Klingon is designed to sound alien, and as such many people find it very DIFFICULT to pronounce.

Klingon also does not share Lojban's goal of being syntactically unambiguous, or to provide speakers with the same amount of freedom that Lojban does; Klingon is meant to come off as a natural language, not a perfect one.

Now, if the question is "Which is best?" or "Which do you prefer?", I can't really give you an answer.

Lojban is incredibly well-designed, having been painstakingly crafted over decades to meet certain criteria. However, it is alo very difficult to use in conversation; it can be difficult just constructing a correct sentence, and once you've done that there's still a large risk it doesn't say what you want it to say.

Klingon is a lot more crude, but it's still a lot of fun to use, and while it's difficult to hold long, philosophical debates in the language, I'd argue that it's considerably easier to discuss everyday matters in Klingon than in Lojban; while it's very different from Earth languages in its composition, it's still similar enough to feel natural once you get used to it.

In the end, I have found that both are a lot of fun to study, in part due to the various challenges that they pose; their alien nature - by accident or design - force one to rethink one's way of expressing oneself. Just take a simple thing like the fact that Klingon deos not have a word for "Hello!" (forcing you to rethink the way you start conversations), or the fact that Lojban allows you to play with so many different linguistic nuances (or to abstain from using the ones present in your own native language)... It makes every conversation an intriguing puzzle!

They also both have intriguing communities that are dedicated to exploring these languages, or to just play around with them. With Lojbanists, you can have a long discussion about what an opera house really is in Lojbanic terms (perhaps zgidracydi'u (music:ish-drama:ish-building(s))?), or whether space and time should be spoken of in Newtonian terms or in causal ones à la relativity theory. Among Klingonists, many discussions center around how one's "human bias" colors one's expressions, with questions such as "Can a day be happy?" and "When does the present tense need to be explicitly stated?".