They are both great, but different views. Narcoossee's at ground level (lagoon level, really) you get reflections in the lagoon. Cali Grill gives you a sky-level view of both the MK and the fireworks, and you feel like you could reach out and grab them. Additionally, sitting above a lighted Tomrrowland at night is pretty cool. One of the things I dislike about the Cali Grill view is that you are above the park and see things that nibble away at the magic.
Pick one for this trip and do the other the next time you go. Or go nuts and do them both! Bills schmills!