Yes, but some prayers and devotions were given to us by God directly, often through the BVM and the saints, and in my opinion they are more powerful, provided of course the right disposition when you pray them. I don’t think it’s an official teaching of the Church or anything, but seems logical to me, especially considering that some of these prayers and devotions come with special promises from our Lord, such as the First Friday devotion, or our Lady, like the 15 promises of the rosary or the brown scapular.