"Shariputra, if one has few good roots, blessings, and virtues, one cannot be born in that land." ---Amitabha Sutra
or even if you do not have good roots, you can still be born there? in this case, one rely on Amitabha's Vow. while the former is lacking faith, which is difficult for some to believe.
either way, they are from different perspective.