Credible data on gun homicides and abortion in the United States are available. The most recent year I can verify for both is 2014. The Guttmacher Institute (founded by Planned Parenthood) reports abortion totals of 926,200. FBI statistics for 2014 show 11,961 gun homicides. In both cases, the rates are considerably higher for minority and low-income Americans.
No two organizations are more alike in their attitudes and politics than the National Rifle Association and Planned Parenthood. Both groups adamantly oppose even modest regulation as a path to ending freedom as they choose to define it. Both organizations have a political party under their influence.
Both organizations provide some worthwhile services: health screening by Planned Parenthood and gun safety classes by the NRA. Unfortunately, the impact of these services is overwhelmed by the impact their other actions have on public attitudes and public policy. The NRA promotes gun sales, and Planned Parenthood advocates and performs abortions.
The social and moral impact of both organizations is to polarize Americans and cheapen the value of life. It is difficult to put hard numbers to the social and family decay these organizations have created, but I believe it is considerable.
Some restrictions of both gun and abortion availability will not end deaths caused by social and family decay. They might, however, turn the tide by creating a slippery slope in the right direction.