I prefer the Napoli/Lahaina Towers, they are newer and goregous villas and ocean front villa is a must. Be very careful however......I have booked in Napoli/Lahaina and when get there been put in the other tower which did not make me happy in the least. If it's me I'd call the hotel after booking it and stay on them to be sure you get what you booked. Management was not very helpful if at all in making it right with us, so last time we left for the Ritz!!
There have been a few reports on this resort you may want to check out on this as well as other travel advisor sites.
I own the Lahaina and Napili towers. They are very nice and have a full kitchen. My parents own in the Molokai and Lanai towers. The difference is basically in the kitchen. If you are interested in cooking and having a full kitchen then the Lahaina/Nap towers are the one for you. The full kitchen is only available in the One bedroom not the guest room. The other units have a small kitchenette so you can still have breakfast in your room fairly easily. I have stayed in both, but with my family we stay in the two bedroom and eat most of our meals in the room We love it here and I have not had trouble with management as they have always been responsive to our needs. They always put my parents in a convenient room to get to our room in either the Lahaina or Napilli towers. I hope you have a great time. We celebrated my parents 40th anniversary there two years ago.
A bit of background to help you choose:
We are long-time owners in the Lanai/Molokai towers (original buildings) at MOC. We have stayed many times in both the original buildings and in the newer Napili/Lahaina towers buildings.
The Lanai/Molokai buildings were originally the Maui Marriott Hotel, for which the CUP (conditional use permit) was for a hotel. Hotel CUPs do not normally permit full-scale kitchens, particularly gas-fired appliances such as stoves.and clothes dryers (Note however that Maui Ocean Club has a large self-serve laundry for Lanai/Molokai building guests which is free -- eg, not coin-operated).
On the other hand, the Napili/Lahaina towers were built within the last ten years with a residential-type CUP which allows gas-fired appliances.
Fast forward to today: Because of its CUP, villas in the Lanai/Molokai towers have abbreviated kitchens with bar-size refrigerators and dish washers, small microwaves but no stoves or clothes dryers. By comparison, villas in the Napili/Lahaina towers have clothes washers/dryers in each villa and fuly equipped kitchens with regular-size appliances.
There is a reason for everything ----- hope that helps!