Which one should you go to?
Proximity, mostly. Kahala sits on the town side, easiest from Kaimuki, Diamond Head, Aina Haina and the Waialae stretch. Pearl Kai is in the Pearl Kai Shopping Center on Kamehameha Highway, which makes it the practical stop for ʻAiea, Pearl City, Waimalu and anyone coming off the H-1 on that side.
Hours differ slightly. Kahala runs 10:00am to 8:00pm. Pearl Kai runs 10:30am to 8:30pm. Both are open every day, including holidays, and holiday hours are usually the same as regular hours.
The menu is the same at both. Availability of individual items moves day to day at either store, so call ahead if one specific item is the reason for the trip.
For a large platter order, order online in advance for the store you plan to pick up from, or call that store. The quantity planner will tell you roughly how much you need first.