Pathfinder is basically "Character Customization Porn: The Ruleset" and Kingmaker was remarkably good at translating that to a CRPG. If there's a hyper-specific character archetype you're interested in making, there's probably a way to make it happen, be it something like "What if I want a Paladin who can smite things at range with a bow?" or "What if I want a Barbarian who trades the class' added mobility in favor of being able to tank in heavy armor while still raging?" While Pillars of Eternity, especially Pillars II, is a much slicker ruleset made for computers, Pathfinder is the raw P&P number crunching machine. Kingmaker also has that whole "Kingdom Building" aspect, which is a little wonky, but still fairly unique for the genre. From what they've said in this campaign, Wrath of the Righteous will instead focus around managing the crusade.
The biggest drawback to Kingmaker (and Pathfinder 1e in general, honestly) is that the learning curve for the system can be rough, especially at character creation when you're confronted with a bunch of classes (all of whom also have three subclass archetypes) with zero guidance of what to do and zero knowledge of what kind of NPC companions you'll pick up.