Exactly, and use 4.14. According to a recent comment from a kernel dev both kernels use the same patch approach. 4.4 and 4.9 are using a different approach that

Exactly, and use 4.14. According to a recent comment from a kernel dev both kernels use the same patch approach. 4.4 and 4.9 are using a different approach that’s less ideal, less complete and apparently less tested.