Favorite Prayer vs Spontaneous Prayer

If prayer is a one-on-one talk with God, then does that mean that a routine, manufactured prayer is less effective or less powerful than one that we say from our heart on the spur of the moment?
It might look that way, at first. We’d expect God to want us to be candid and open with him. But that doesn’t mean we can’t prepare for our talk by reading the words from our favorite bible verse, or from published works.
The Bible is full of examples of verses that can easily be used as prayers when our own words fail us, or when we are too distraught, too overwhelmed with our worries, to be able to think clearly. There are also many, many published works that are full of prayers and devotionals that work well.
We do this ourselves with our friends and loved ones. We often prepare ourselves before we have a serious talk with someone. I believe that God would want us to be no different with him if that’s what works at that moment. We teach our children to say “Now I lay me down to sleep,” as soon as they can remember it, and “God Bless Mommy and Daddy and...”
The worst that can happen is that we take the easy way out too often and forget to try to talk on our own. The best that can happen is that, by having something to say when we need to say it, we do not avoid talking to him. I think it would please him more to have us come to him prepared than to feel we cannot go to him unless we have something original to say.