80% chance of green, 18.50% chance of blue, 1% chance of purple, 0.50% chance of exotic.
OR 89% chance of blue, 9% chance of purple, 2% chance of exotic would be excellent, since every 10 or so strikes you SHOULD see atleast one engram/item of purple or better quality.
Just give bosses a drop table specific loot drops for each boss to encourage different strikes with role chances like this and people will enjoy strikes more.
Thanks.
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#Destiny
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I don't think it should be per boss(because different strikes have a different number of bosses and people would just quit until they got the better ones), but the postgame rewards for level 24+ strikes should look like your second option. The weekly should go unchanged as it has a specific purpose.