1. Glass blocks are heavy and bulky. Create a Block is plastic and lightweight. When you put them next to each other, you really can't tell which one is the glass block.
2. No more messy glass drilling. The Create a Block has a hole in the bottom so you can add your lights.
3. The Create a Block can snap apart so you can add fun things in the middle.
4. The price is the same for both. Actually the Create a Block is a better deal because you don't have to buy the glass drill bit and waste all your precious time drilling holes.