Don't see how it can be a happy thread when you've set it up as an adversarial one with a big vs small bent. That's just setting up for people to post why their choice is better than the other choice.
They are just cruise ships with varied dining, entertainment, shopping, etc options. All cruise ships are different. I don't see the need to make the distinction, you choose the ship that meets your needs and desires, whether that ends up being big or small (which I don't even know what the definition of that is) what does it matter, as long as you personally are happy with your choice.