Weekly Heroic Strike

The Weekly Heroic Strike is a random Strike, buffed to at least level 20, with the Heroic Mission Modifier that changes every week. Completing the Strike will award the player with all rewards for the current difficulty, and prevent the player from receiving the mission rewards for that difficulty and every difficulty below it. Higher difficulties can be completed at a different time to gain those rewards, too.

The reward system is a little misleading. In reality, each difficulty can award 3 Strange Coins, among other rewards. Completing the Strike once on the highest difficulty will reward the same amount of Strange Coins as when every difficulty is completed in ascending order. To save time, Guardians should simply complete the highest difficulty they can.

Nightfall Strike
The Nightfall Strike is the weekly Strike, upped to level 28, and has many Mission Modifiers, in addition to always having Heroic and Nightfall. The Nightfall modifier makes it so that if all members of the Fireteam die, the Fireteam will be returned to orbit; no checkpoints. Legendary and Exotic equipment have been seen as rewards for completing this Strike.