Frankly speaking, when it comes to the best stack up of PCB, which actually refers to a couple of aspects, such as the common base material, dielectric, shield and reference layer; However, all of these depend on the specific requirements of PCB.
Here are some general parameters for your reference:
![](/data/upload/image/201903/a1cb0b2d729d8f4672a4cd898b7b86b3.jpg)