Kia Orana egen, welcome to the forum.
If it helps with your decision, Manuia Beach, in Arorangi, has a bigger site compared to the Rarotonga Beach Bungalows, in Titikaveka, and provides an adults-only stay. Manuia has its own Beaches restaurant and bar, plus an infinity pool, located next to the beachfront. I understand that the accommodation complex has been renovated recently. The lagoon area is narrower than the lagoon area where RBB is situated. The reefline breaks reasonably close to shore in front of Manuia, which is a bonus for whale-watching and adds interest when looking out to sea.
Rarotonga Beach Bungalows occupies a little spot right alongside Moana Sands Hotel in Titikaveka. Nearest licenced dining is next door at the Sands restaurant at Moana Sands. The Bungalows are also in close walking distance to Little Polynesian café and Te Maire Nui gardens café. Broader lagoon area, with the Tikioki marine reserve being good for snorkelling and swimming, in this area.
When are you considering a visit?