Statistically speaking, it doesn't matter what they decrypt as. It's a guaranteed blue engram. Most people get 2 or 3. The same chance of getting a legendary exists in that random as it does within the game...The difference is that there's a guarantee. You can stop and farm for 20 minutes if you choose make that 30 minute strike into a 50 because you wanted to test your chances...But, your chance doesn't change, it's statistically less than a % chance of getting a legendary...10% or so of getting an engram at all. By the time you finish that farm, I've done 2 Strikes, I have 4/5/6 engrams...You have 0. - Which method was more effective? This really isn't a hard decision...This is grade-school level arithmetic.