Best lens for mola mola?

Hi,

Will be going to Bali, Indonesia to see mola molas.

What is the best lens to use? I was considering 10.5mm or 12-24mm. Thanks.

I am hoping to be in Bali next month also to see Molas and have both lenses you mentioned. I am leaning toward the 12-24, but will probably use both. Depending on the vis and number of other divers in the water, I think the 10.5 might too wide and bring a lot of unwanted objects in the frame. Then again the fisheye distortion might make for some interesting shots of their odd shape.

Anybody have any examples from these lenses?