Christian has a budget of $1000 for a gaming laptop. Leo says that's a good budget. Alienware is good, as is MSI. Leo recommends also taking a look at the ASUS ROG gaming laptops. There's a pretty broad range of price points. They're running Windows 10 with DirectX12. That is Leo's first choice, and Christian can customize them based on his budget.
The problem with gaming laptops is that it's hard to tell if they're expensive because they're better or because of fancy styling. Since Alienware is owned by Dell, he should be able to find a good match. Christian should make sure he gets a DirectX12 compatible system since that'll be the standard moving forward.