For those of you looking to level-up quickly, this is a good reference. I would highly suggest you not do any Exotic Quests, Nightfall, Milestones, or any other activities which give "Powerful Gear" until reaching level 265. It's harder to level up past 265, so you want to save those to be able to move up. Personally, as soon as I turned 265 I went right up to 275 because I waited on decrypting all the Powerful Gear/Luminous Engrams.
Additionally, don't pick up the Luminous Engrams awarded by the clan activities from Hawthorne as those are Powerful Gear also.