I think purely on their level of impact on the game, Moon and Daniels are very close, despite the very different styles they play. What they would each bring to the C's, will ultimately depend on who else the C's bring in to complement them off the bench...particularly at PG.
I think they both are similar level of defenders at their positions. Neither are true shut-down defenders, but they both are passable man-defenders, and have the ability to make plays on defense. Daniels with deflections and steals, and Moon with blocks.
But on offense, they are very different. Moon is a super-athletic finisher, whose game consists of highlight real dunks, and 3 pointers, without much in between, while Daniels is a creator, who can make his own shot, and while not being much of a perimeter shooter, can fill it up from midrange, and also can create more for others.
So offensively, Daniels can play on the ball, which would allow House to play PG, meaning they would still have a hole at backup SF. Moon on the other hand, cannot play on the ball, meaning they would still need to find a backup PG, who can run the offense.
So ultimately, I don't know if it is worth arguing about who is better, the question is, will Danny be able to fit them into the system well.