I'm a native French speaker and fluent in English (and of course, as luck would have it, I'm going to stick grammar mistakes in this post) Some have pointed out that French is almost always longer. It's a bit more complicated than that. French uses a wider vocabulary than English, and uses many different words to convey different connotations. Words, as a result, tend to be longer, because they carry more information…
>> French uses a wider vocabulary than English This seems an extraordinary claim, given that English is generally considered to have the largest number of words of any modern language (mostly because we just steal them).
I would think that literary French generally uses a wider vocabulary than English though, at least because repeating words in French is to be avoided at all costs, while it's more acceptable in English.