XB Series X or S. Both work, but S has way worse graphics. So if money is not a point for you, you should definitly buy the Series X as this is the way more powerfulll console with the way better value for the money. If you want the Series S, look for the 1TB Version, as the old S with 512 GB is not well suited for this memory usage beast of FS.
Conclusion: Buy the Series X if you can and the money isnt’ the problem!!!
But don’t buy an XB One X or XB One S!!! This are old lastgen consoles, which can’t run the Filghtsim at all.