Really, the best way is to gain Reputation and Vanguard Marks, and by the gear yourself, because it's not randomized, and you're choosing what you want.
But if you're asking to receive Legendary gear in the form of engrams, then the best way is to [i]farm[/i] for it.
You can search on YouTube: [i]Destiny Engram Farming[/i].
English
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Thanks for the help, I am working on gettin my vanguard rank up to be high enough to buy some vanguard armor. And thanks for the engram farming help as well!
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No problem. Though working on your Vanguard rank may take a while, at least you're certain you'll get what you want.