[Gandalf Parker]

Actually neither term should be used. Artificial Intelligence isnt all that hard and has been done often. Its a common topic in the AI work groups. In those groups they joke about AI always meaning almost implemented because anytime an AI project is completed it stops being referred to as AI. Like diagnosis software, or autopilot, or streetlight management. All were AI projects until they were done.

What the players want is artificially human. As just one example... artificial intelligence would use a straight line. It takes a artificially human would sneak around behind or do a flanking attack. Or better yet to randomly select between them, sometimes when its even a bad idea but might be a surprise.

What programmers, especially game programmers have learned is that the closer you get to AH the more random gets worked in. So its often a shorter project that instead of starting with intelligent then gradually add more randoms, AH is often best achieved by starting with it being random then making it gradually more intelligent.
Just FYI trivia