I remember an article some years back that hypothesized that successful languages were successful because of their ability not to effectively communicate, but to be effectively understood. For example, English has lots of words that add easily inferable context. "Its", "is", "of", "from", etc. In fact, these words make up huge chunks of the written and spoken text. However, what they appear to also do is slow down the rate that information is communicated, making it easier for the person being communicated to to actually breakdown and process what's being communicated. It would stand to reason that some languages are therefore easier understood when written, others when spoken. Whether or not categorical differences exist - such as, communicating mathetics in English is the best or worst way vs French, for example - I'm not sure. Any reading on the topic?