Grouped product or configurable product?

Question

I know it's frequently asking question. But I have a different problem related this.

In my store customer will pay different price by color and size.

For example:

X product: Blue, S: $500
M product: Blue, L: $1500
Y product: Yellow, S: $550
Z product: Green, L: $800
T product: Green, XXL: $1800

Which product type I need to use? Grouped or configurable?