New Advent Encyclopedia has a sizable article on the controversies of grace. In it, you will find three more alternatives to Thomism and Molinism: Augustinianism, Congruism, and Syncretism.
The last line of that link reads, “Consequently [Syncretism] ends like the others in the inevitable conviction that we are confronted by a great mystery.” From this, hopefully you can gather that the Church has declared no preference on the view of Grace, it remains a mystery.
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