In general, you should make the moves you believe to be the best ones, even if the moves are similar to ones you did in the previous shadow. Realize that each round will be judged on its own merit, though, so the context of the critiques you receive could change, even if the moves are nearly identical. That is, BamBam's perception of what is strong and wise may change, even if yours did not. Make sense?
You can also use your shadow to experiment with something you haven't tried, which is also valid, whether or not the moves you make are the ones you believe to be the strongest.
Hope that helps.