If you're already familiar with sub-d modeling in 3dsMax to produce organic shapes like that, you would probably want to continue using it for organic shapes.

MoI is very useful and fast for more mechanical shapes, things that are more defined by 2D profile curves.

Organic modeling is not really a good fit with any CAD program, organic modeling is where the polygon/sub-d type modeling method is strong.

On the other hand, polygon/sub-d modeling methods are very poor for manufactured mechanical shapes that have holes punched in them like steel punched parts or things like that. For such shapes things are reversed and sub-d modeling becomes a poor choice and CAD modeling methods become very good.

But the type of model that you are doing is quite a ways into the "organic sculpted shape" type category.

- Michael