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This is a very interesting topic and basically impossible to answer.
The reason that I find it impossible to answer is that they are good in different ways.
Below is just a couple of categories:
Muck: Lembeh Strait
Mantas: Sangalakki, Kalimantan ( Indonesian part of Borneo)
Corals: Raja Ampat
Places that disappointed me, so far:
Palau & Milne Bay
On the Planning List:
Solomons, Fiji & Mozambique