I'm tempted to say, if humans consistently reasoned to the best given (and known) choice, in any given situation, the illusion of freedom would be clear. It's the experience of seeing a better way, after the fact, that shows me that what I wanted was a bad "choice." But, could I have chosen otherwise? I don't know. Why would I have chosen otherwise? Reasons.
We choose what seems best to us, (i.e. what we want) with every significant choice we make. If we don't know what to do, and just pick, we know we are not free. In that case, we're bound by a situation that doesn't allow us what we want, whatever that would be. We want what we want, even when we don't know what that is, haha.
We always choose what we want. That is an inviolable law. I cannot choose to want that which I don't want. If I do choose to want what I dont want, then some overriding reason has caused me to want what I don't want. Or, to put it differently, I now want something else, and I can't simply pull myself up by the bootstraps and choose to want what I do not, right now, want. Why is this? I must have a reason.
Reasons are why we choose. If we always reasoned to the best choice (multiple, really good choices are arbitrary, so they dont require freedom in any significant sense) we would see that we always want what we want, and that can never change.
Again, we think we have freedom to choose differently because we can choose what we want, only to discover after the fact, it is now not what we wanted. But, that observation, in and of itself, tells is nothing about whether we could have done otherwise.
For me, the phenomenology of human wanting shows why the usual notion of human freedom is suspect. Sure, I can choose x, but will I? Nope. Why not? Reasons.
I would say there is a phenomenological determinism when it comes to.the will. We want what we want, and we can't choose to want otherwise. That is our experience, I think. I don't know if that is a version of determinism, or if it would be interesting were it true.
As a side-note, it would be very strange to complain that God made me do what I wanted to do.