I do both video and photography. But I really like doing video. It's more personal. It's more fun. And it's more realistic.
Video tells the viewer what things are like down there.
I even digitize my best underwater photos to use as closeups when I compile my dive videos. You need two lights for smooth color. Look for a housing with a dark orange-red filter that can be switched underwater. My Ikelite housing takes amazingly good-color video because it makes no compromises. For closeup or nighttime video, you turn on the lights and click the filter away.