Personally, either of the first two would be okay. But I hate the fact that I can't grind on crucible or strikes to get marks. And earning 30 a day is cool if it was only for 1 character!! Also, I think we should get marks for the 40 or so year one legendaries that are now useless to me. Please vote in high hope that bungie will change something in this inefficient system.
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Honestly you get so much from random drop purples. 30 a day per account is fine and means I don't have to PvP more than one game a day.