I think most definitions of “superior” are so value-laden that they cannot rise above the level of subjectivity.
But languages evolve. There is a language that cells use to constuct proteins: it’s called the genetic code. Many liguists and information scientists will tell you the genetic code is pretty much a mess, an obvious accretion of billions of years of random tweaking coupled with natural selection. It has no real logic to it, and could be better in a number of definable ways. Yet it has become largely standardized; the world over, in every living thing, the codon ATG codes for methionine. On another planet, it may be different, but on earth, there is a nearly “universal language” of sorts, written in our DNA. The fact that there are a very few organisms that utilize some"alternate" codons does indicate that the genetic code as it exists is not the product of some historical accident that froze it for all eternity; it does evolve, and it’s resonable to conclude that one form of the code has almost entirely beaten out the alternatives. It’s not pretty, but it does greatly predominate. Life, it seems, has indeed standardized, and we might reasonably conclude that the so-called “universal genetic code” is the best one nature has come up with so far. It is the “superior” language for encoding proteins.
When I look at meme theory (a la Richard Dawkins, et al.), I can’t help think that random mutation and natural selection, the basic mechanisms of biological evolution, are truly universal in their scope, and don’t just influence things that we generally think of as being “alive”. All “life”, in fact, may just be a vector for the reproduction and evolution of memes, starting at the basic level of the genetic code written in our DNA, and working right up to pop songs, poems, constitutions, and even religions. Minds are the ultimate substrate in which memes “live”, and language is the means by which they reproduce and evovle. Some memes are more “fit” than others and proliferate. Some are unfit and “die” without even reaching another substrate.
As DNA has proven to be the best medium for “writing” and transferring the genetic code, so a language may prove to have properties making it the superior means of meme mutation and reproduction. DNA is, chemically speaking, a relatively robust molecule; its building blocks require only about 50 or so atoms to encode a bit of information, which is enough to make it structurally sound without making it totally immutable and unwieldy. It’s just stable enough sustain life without severly retarding evolution by being perfect in its fidelity from generation to generation. It’s strong, but changeable, and that makes it very powerful.
I bet the same is true of languages, and what drives the evolution of language, just like what drove the evolution of the genetic code, is the rate of mutation of, and the selective forces placed upon, memes. The structural integrity (or lack thereof) of the medium by which memes move from mind to mind, has a direct impact on these things. DNA is the medium all cells (I’m leaving out some viruses, which still ultimately rely on DNA) use to transfer the language of protein production. The standard genetic code is (almost) the universal language of protein production. DNA, and the code that is on it, have proven “superior”. Is it not reasonable that, in an analogous fashion, some laguage will also prove “superior”?
Given current trends, if I had to bet on what that language will be, I would say it would be largely a decendant of modern American English. Am. Eng. is simply becoming the de facto standard of commerce and technology, and those things rule in this world. Some people (like the French) try to fight it; many lament it; some feel insulted by it; some can’t understand it. It doesn’t matter. It doesn’t have to be pretty, or elegant, or more efficient at any particular thing. It’s just got to have the best mix of qualities available at a given time, and natural selection takes care of the rest. The “superior” language, then, might be defined as the one that “wins”. As the world becomes a big global community, having one lingual standard is probably an inevitability. It looks like it’s going to be some form of English.