Our first NFP IRL episode with co-host Kathleen and we are talking about Providentialism vs responsible parenthood. You might find after listening that it's less a "vs" rather a partnership between the two terms throughout the different seasons of your journey with NFP.
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If you want to read along:
Humanae Vitae Definition: With regard to the biological processes, responsible parenthood means an awareness of, and respect for, their proper functions. In the procreative faculty the human mind discerns biological laws that apply to the human person. (9)
With regard to man's innate drives and emotions, responsible parenthood means that man's reason and will must exert control over them.
With regard to physical, economic, psychological and social conditions, responsible parenthood is exercised by those who prudently and generously decide to have more children, and by those who, for serious reasons and with due respect to moral precepts, decide not to have additional children for either a certain or an indefinite period of time.
USSCB definition: Responsible parenthood requires that husband and wife understand God's design for marriage—that it is love-giving (unitive) and life-giving (procreative). Spouses ought to be well-formed in understanding Church teaching and reflect upon their responsibilities toward each other, children already born, and the wider society when deciding when to attempt to conceive or not.