If it is between the two, personally, we prefer the grounds at the Mauna Lani. The extensive remodel is beautiful and we also prefer CanoeHouse to Manta for dining. The beach at Mauna Kea is better than Mauna Lani since it does not have a coral entry. It all depends what you want to do during your stay.

If money is not a consideration, I would recommend the Four Seasons Hualalai. Beautiful property, redesigned rooms and great restaurants.