Checkout the statistics below then "You Decide" which is worst. In my view, neither situation is good, it is impossible to choose one over the other.
Sexual activity. In a study of 700 adolescents, researchers found that "compared to families with two natural parents living in the home, adolescents from single-parent families have been found to engage in greater and earlier sexual activity."
Source: Carol W. Metzler, et al. "The Social Context for Risky Sexual Behavior Among Adolescents," Journal of Behavioral Medicine 17 (1994).
A myriad of maladies. Fatherless children are at a dramatically greater risk of drug and alcohol abuse, mental illness, suicide, poor educational performance, teen pregnancy, and criminality.
Source: U.S. Department of Health and Human Services, National Center for Health Statistics, Survey on Child Health, Washington, DC, 1993.
Drinking problems. Teenagers living in single-parent households are more likely to abuse alcohol and at an earlier age compared to children reared in two-parent households
Source: Terry E. Duncan, Susan C. Duncan and Hyman Hops, "The Effects of Family Cohesiveness and Peer Encouragement on the Development of Adolescent Alcohol Use: A Cohort-Sequential Approach to the Analysis of Longitudinal Data," Journal of Studies on Alcohol 55 (1994).
Drug Use: "...the absence of the father in the home affects significantly the behavior of adolescents and results in the greater use of alcohol and marijuana."
Source: Deane Scott Berman, "Risk Factors Leading to Adolescent Substance Abuse," Adolescence 30 (1995)
Sexual abuse. A study of 156 victims of child sexual abuse found that the majority of the children came from disrupted or single-parent homes; only 31 percent of the children lived with both biological parents.
Source: Beverly Gomes-Schwartz, Jonathan Horowitz, and Albert P. Cardarelli, "Child Sexual Abuse Victims and Their Treatment," U.S. Department of Justice, Office of Juvenile Justice and Delinquency Prevention.
Deadly predictions. A family structure index -- a composite index based on the annual rate of children involved in divorce and the percentage of families with children present that are female-headed -- is a strong predictor of suicide among young adult and adolescent white males.
Source: Patricia L. McCall and Kenneth C. Land, "Trends in White Male Adolescent, Young-Adult and Elderly Suicide: Are There Common Underlying Structural Factors?" Social Science Research 23, 1994.