i am wondering the durablability difference. Is one more sturdier than the other?
cement siding is easier to put up and quicker to put up. Both will provide the same protection if put up properly.
Some insurance company's do not write policy's for fiber cement homes. If there is water damage, for instance, behind the siding, it is not often discovered in time to have a small claim. The claims have been huge, in some cases. Also, I have seen this type of siding damaged by wood peckers.. The bird can detect an insect or larvae behind the siding and go after them leaving behind numerous holes.. In my opinion, stone veneer is almost as good as brick.
In a way, fiber cement board is better than stone veneer. Houses are rotting down everywhere stone veneer is installed incorrectly. There's a lot of hacks out there gluing the stuff straight onto wood, making it the next home repair nightmare. If done correctly, it might be more durable but it's not sturdier.