The Bible teaches that the highest form of prayer is secret prayer in the closet of tryst with the father. That is not true nor is it Biblical fact. Praise has become a substitute for the seriousness and demanding life of prayer. God is good but it is no substitute for laboring in prayer and going to garden with Jesus. Nor is it a higher form of prayer than fasting.
Praise is worship and most of that is done in public worship.
Prayer is a burning incense that never ceases to give off the fragrance of divine nature. Praise acknowledges God's greatness and worthiness. But Jesus and Isaiah made it clear that praise without obedience to His moral instruction is unacceptable to God. God's LAW is simply God's LOVE in writing. It is impossible to separate the LAW of God from the LOVE of God.