How can it be "the most sound" if Reformed Theology holds to the Five Points of Calvinism? Not a single point in TULIP is "sound" since it controverts plain Bible truth. In the end they have to resort to the travesty that a sinner must be born again BEFORE he can believe the Gospel. Think of the absurdity of that. And if God predestines some to Heaven, it follows logically that He predestines the majority to Hell. Think on that for a moment.
What we believe is that men is already going to hell, God out of his mercy and grace chooses some of those who were going to hell to save them, and leaves the rest to fulfil their fleshly desires.
It's God who grants saving faith, without faith none would be saved, and we know faith is a gift of God, so in order for someone to believe, he needs the holy spirit convicting him first, then he can believe, that's what we believe as well.