This is intriguing. I looked up Bengals and Savannahs just to see the differences. Here are two samples:
This is a Bengal cat.
This is a Savannah cat.
To my untrained eyes, the most obvious difference is the size and shape of the ears. The Savannah have ears which are distinctively different. Plus the Savannah has got longer limbs. The general outlook is not exactly cat-like. I mean cat-like as in domesticated cat-like. The Savannah looks more like a leopard.
One thing I noticed about the prices of the Savannahs is that the price drops as the you produce more generations. So buying an expensive Savannah doesn't necessarily mean that you can sell the kittens for the same price. From an investment point of view, I think I can get better returns breeding, say, the Persian.