So, given the systems of either:
Observer - You are a character, as in a book, or play, unfolding according to a script. Choice is an illusion caused by the passage of events that occur in sequential order.
or
Controller - You are a character in a sandbox game. There is no linear progression and you are free to do as you wish in any order.
I lean towards neither, or rather a composite of both.
Have you ever noticed how we desire both of these oxymorons? Take driving for example. The thrill of driving a car is exhilarating. Being in control of something that could easily kill you, or somebody else with one single mistake, one moment of recklessness. And yet, the self-driving computer controlled car that takes you to your destination at a wave of the hand is the stuff of scientific legend, edging ever closer to reality. We desire both to have the freedom to drive a car, and the freedom for a car to drive us, according to our whim.
Ever heard how people are fearful of change? We crave familiarly which in terms of my scene graph explanation means staying on the current path you are on, in essence, not exercising free will. Many of the choices we make are of course heavily determined by previous decisions, and determinism will undoubtedly guide many of our actions just as a chain reaction causes a series of events to unfold. If this were not so, the composite sum of our lives would always be zero. If we constantly exercised free will, we would constantly pull our lives in different directions and yield no progress.
Therefore, life is more like an audience participation movie or non-linear game progression. There exists a script, and we are destined to follow portions of it, however at any time we have the ability to exercise a deviation from the next logical step. Think an options window popping up with 4 possible choices and selecting the desired outcome. We may deviate, we don't have to, but we can alter our path by exercising free will. You can sit back, and let the car drive you, or you can take the wheel, and drive it yourself.