Why not simply "compare" the two products?
Simply press the "Compare" button on both sides of the products and then go to "Product comparison" - "Show PC cases" .... I'm sure you can do that too.
...so there's the form factor: one is a mini-ITX and the other an mATX, (important because of the motherboard). Then the number of drive bays ..... and so on..... and so on.