I think that neither is more powerful because one leads to the other. The power to persevere is the power to stay riveted to one's vision, and block out all distractions. Technically speaking, one who perseveres has already manifested a life of ease and abundance because perseverance is a state of mind, where nothing will deter one. If nothing will deter one, then that state is tantamount to having already achieved a state of abundance (abundance of commitment, which leads to a state of ease and grace) and ease.
Think about it: have you, from time to time, been so committed to an outcome that it's non-manifestation was not a possibility? Hence, perseverance = abundance and ease.