They're all good stuff. It all boils down to how much you want to spend. Remember that they all do the same thing (lift the rig so you can stuff larger tires and hit harder trails).
Spacers are the cheapest solution but long term the ride gets harsh. It's the technology behind it that causes this. OME (coil and shock) are plush like stock. Coilovers are the best for high speed and even super low speed as it is valved perfectly for each vehicle (in most cases). The more you spend the better the ride ultimately gets while you're on the trails. If you can afford it, get the $$ stuff, otherwise just get the cheaper solution and call it a day.
Btw, those companies I list have FJ stuff already (since the FJ shares the same suspension as the 4runner). This is especially true for the spacers so if you want spacers, go get em
Good luck