If God is sovereign, then it follows that he is happy. Sovereignty implies dominion and autonomy, and a sovereign God accomplishes his will because he ordained everything to happen. Such a God is always happy because everything he ordained happened, and he would never do anything to displease himself.
If God is subjugated, then it follows that he is frustrated. Subjugation implies no dominion, no autonomy, and a subjugated God will not always accomplish his will because he did not ordain everything to happen. Such a God will, at times, be frustrated because something he did not ordain happened.
The question then remains: do you serve a sovereign, happy God or a subjugated, frustrated god?