I would really recommend finding a way to play that suits how you enjoy your game time. If you like PvP focus on Crucible marks and raise a Faction. Also if you wear a faction class item during your Bounties and your turn ins you'll raise the Faction rank of your choice faster as your focusing all efforts on that faction. If nothing appeals to you with the Faction vendors then focus on Strike and Bounties and remember to take OFF your Faction Class item otherwise you will never raise Vanguard rank. I wish they hadn't take out the Mark/Rep turn in for Resources, that was also a valid way to generate Rep or get a few marks.