KF or IKS for accumulation?

Which one? I did some research and I came to the conclusion if I want to follow through with Boglehead and then FIRE, the best would be accumulating with IKS and then moving everything to AF, but can't I do the same with KF?

How is KF much different form IKS? Which one is better long term? Is KF better if I want international funds? American market?