ILWI is definitely a bad choice for 3vs3. I have played several games there and I think that the level is not designed for a 3vs3. The flagholder can camp very easy there and stay alive for ages. It takes always much time to score any point and the games tend to be just boring.
Of course it is a good level, but rather for a 5vs5 or more. I would like to see it in big JDC games, but not in such tournament as JJ2WC.