As it was said, stainless is allegedly more efficient and much more durable. Instead of getting dinged on clams running through the mud or sand, it will cut through it. But as you know, you can ruin your lower unit. They are more expensive, but last longer.
If you are going to be running it around in shallow water and rocks on the North Shore or upstate lakes (which you probably will be in a bay boat. I know where you're fishing
) I would consider staying with aluminum. Stainless will ding, bend or break when hitting a rock and ruin the lower unit. Aluminum will be cheaper to replace and probably not damage much else.
Chris
If you are going to be running it around in shallow water and rocks on the North Shore or upstate lakes (which you probably will be in a bay boat. I know where you're fishing
Chris