While there is no best prayer, some Christian prayers have gained far more popularity than others. Many of the most widely used Christian prayers come from Bible passages, such as the popular Lord's Prayer, which comes from Matthew 9.
The Lord's Prayer has multiple versions in which words differ, but a common translation is: "Our Father, who was in heaven, hallowed be thy name, thy kingdom come, thy will be done, on earth as it is in heaven. Give us this day our daily bread and forgive us our debts, as we forgive our debtors. Lead us not into temptation, but deliver us from evil, for thine is the kingdom, the power and the glory, forever. Amen."
This prayer is important in the Christian tradition for two reasons. First, Jesus provided the words himself and instructed his followers to take the prayer to heart. Second, it covers all the standard points usually mentioned in prayer, including giving thanks, asking for forgiveness and acknowledging God's power.
Another commonly used prayer is the grace prayer. This passage is a short prayer of thanksgiving usually offered by Christians prior to eating a meal. One derivation of this prayer is "Lord, bless this food to our use, and us to your service; make us grateful for all your mercies, and mindful of the needs of others. Amen."