God is pleased the most when we praise and worship him. God is also pleased by some other things like when his children live above sin and defeat but he is mostly pleased when we praise and worship him. Johoshaphat king of Judah praised God with the instruments of praise when faced with the combined forces of the enemies and he became victorious. 2 chronicles 20. Paul and Silas were in prison. They prayed and praised God and God moved without delay.
From my personal experience, my family had a deliverance programme two years ago. We prayed far into the night without any tangible result but the moment the Minister called for a session of praises and worship, things began to happen. So l conclude that God is mostly pleased by praises and worship.