In the end, there aren't really that many differences between them; there is more variation from person to person then there is from subject to subject. Certainly the greatest difference I notice is one of passion; the good artists and the good engineers share a passion for what they do, and it's easy (for me) to talk to passionate people --- polite or no, passion is infectious and soon I don't care a whit about turn-taking or eye contact. The students who lack passion --- who are in engineering for the money or art because it's "easy" are the ones that make small talk.