Why is the Xbox Preorder such bad value (390€ only 3700 points)

If you buy the preorder on PC, you get 4800 points (+960 if you opt out of the physical stuff) for 480$ which is around 450€.

If you buy the same preorder on Xbox you pay 390€ and get 3700 points (no physical stuff btw).

Seriously? This is way worse than the PC preorder.

Is there any way to buy the preorder on PC and redeem it on Xbox?

Thats because you are buying it through MS, and they are charging you more by adding their % on top of the price GGG charge on their own shop effectively.

Yea, if you aren't concerned with phsyical goods and don't want to take advantage of that point kicker then in the US region the xbox pack is fundamentally a better deal.

Not sure about other regions, I'm sure there would be different calculations in japan.