California Grill is by far the best restaurant at WDW. Although I have not been to the Aloha Spirit, it seems that you almost always sacrifice food quality for entertainment at the dinner shows (like HDMR, etc.)
Before I make my next comment, I want to say that I am a fan of WDW and have been several times but frankly the food at WDW tends to be fair to good but not great overall. I don't go to WDW for the food, I go for the entertainment and atmosphere. CG is one of the few restaurants that I really look forward to going to at WDW.
Upon my return from our family trip in October, I will be sure to provide my feedback on my latest experience at CG.