I really can’t recommend Kingmaker, it has some nice ideas, but what my players really liked, was almost entirely added by me. The kingdom building system was a real slog (and frankly broken, until fixed in a later hardcover release) and with the sole exception of a single CR4 monster in the first adventure and a daemon in a latter part of the adventure path, it was pretty much a cakewalk for my players. A ranger, a summoner, a cleric, and a ninja destroyed that adventure path, and frankly the summoner wasn’t the broken character.
The main plot is all over the place, and the last adventure is a pretty tough to add to the preceding 5. Foreshadowing (regarding the main plot and the situation in the north) is pretty lackluster, and is one of my major complaints. It certainly has the potential to be great, but I would suggest to remove certain mechanics (exploration, maybe kingdom building), add some diplomatic visits to neighboring countries (the book Guide to the River Kingdoms is an excellent resource).
I am currently running Wrath, but I have to say, that this adventure suffers from the inexperience with the mythic rules, but the core of the problem is, that adventure difficulty is to low across the board. Mythic just multiplies the problem by a factor of 2-4 (depending on the tier and the fact, that mythic characters just have plenty of endurance).
The story is very interesting and I like the fact that it is really inclusive, but be prepared to modify every single encounter (and cut/combine plenty of them).
Jade Regent is very good, but even then, I would suggest to shorten part 3 and to remove a couple of new subsystems (and maybe a companion or two).