Well for one the reward for the weekly is 9 coins for everyone doing the heroic. As for the nightfall it makes no promices besides double xp. Its reward is a RANDOM ITEM so you may recieve anything from legendarys to exotics. But they may not always be for your character. Example im a hunter and i recieved sunbreakers for warlocks. Your not the only one. Its one of the things that makes the game challenging and keeps people from becoming too overpowered