Answer:
That depends on who you ask.
To Baptists, a believer's baptism is the Biblical choice. Baptist believe that the Bible always mentions baptism only after repentance and putting one's faith in Christ. They believe it is an outward symbol of an inward change in someone's heart.
For Catholics, neither mode of baptism is better than the other. Catholics recognize the validity only of a person's first baptism, provided that it occurs with the intent to baptize, is done using water, and is done 'in the Name of the Father, and of the Son, and of the Spirit.' Other Christians' thoughts vary.