Hi, this will be a helpful video for you :
Always prefer Nvidia to AMD GPU.
Note that the more cores you have, the better x-plane 11 will become along the updates.
To me, money is more efficiently invested in the GPU than in the CPU, in terms of performance. Watercooling is strongly recommended to improve performance and extend life of heating elements.
Then it's a personal choice depending on your budget.
Guillaume (nor affiliated with Laminar Research)