I believe that free choice is a label we apply to mental phenomena which we do not completely understand and that we, as thinking beings, are not in a position of control over our own behavior in as great a degree as our consciousness would lead us to believe.
For me, this does not mean that free will doesn't exist and this doesn't mean that we have to believe in fate. What it means is that there is a great mystery taking place right inside our own heads and the hand of biology and the hand of fate may, in the end, be one and the same. Or, they could be different.
It's impossible to know.
Personally, I try to hold back from making the "final" assumption on things that seem to be beyond my ken, so I do not believe in fate and I don't disbelieve in certain scientific and physical notions of determination, behaviorism, and the lot.