What's easier, moving megalithic stones or cutting megalithic stones?

It's a mystery how ancient people carved and moved megalithic to build some of the ancient world's most magnificent structures and buildings. But it's also a mystery as to why they wanted to use such large stone blocks in the first place? Why not use smaller, more manageable stone blocks instead?

Most images and video either belong to me, or were obtained via Wikimedia Commons or Pixabay. Walling Wallington video clips from this video: https://www.youtube.com/watch?v=lRRDzFROMx0