I believe that both of these are gems in different ways. No Small Parts has great tension building throughout it, and the cameo at the end from Frakes and Sirtis was the icing on the cake.
Crisis Point, though, was a classic holodeck story, with the crew facing hijinks. I loved the TOS movies gags at the start of the movie, but in the meantime, we also learned just how screwed up Mariner truly was, and I really liked that development. The bit at the end with Da Vinci appearing right at the end was hilarious.
I'm giving No Small Parts the point.
Crisis Point - 2
No Small Parts - 2