Im sure that everyone has good and bad experiences with anything in this life. Some people have good and bad stories about every gear outfitter for the grand. I for one CAN NOT recommend Moenkopi. I read all the stories about how brady saved their trip. I think that it is amazing when someone would go way out of their way to save someones "once in a lifetime" trip down the grand canyon. However, we had the opposite experience with Brady and Moenkopi. No specifics but mostly related to rented outfitter gear failure. Just glad we didn't have to rely on the sat phone working in an emergency situation cause it seemed like everything else failed. Group member on our trip had used Ceiba for a previous trip and loved everything that came from Ceiba so that has to be a decent recommendation.
I hope whoever you decide on it works out great for you. As long as you have enough food and a working water filter and duct tape, you should be able to get your boats down that amazing stretch of water and thoroughly enjoy every minute of it.