Guild wars question???? nightfall?

Nightfall is a standalone product, but if you are new to the game, I would suggest getting Guild Wars Prophecies, as it has way more content, more beginner friendly, and for me, a way better storyline. I would only get Nightfall for the two new cles and the addition of heros, which are customizable allies that follow you around. Factions also give u two new cles and allow you to have new features like Alliance Battles, but of course, Faction's continent is way smaller than Prophecies'.