For all those Replacement Window decisions - just read, review or post a question. You will be helped!
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Which one has better water/air infitration? Thank you in advance.
The 400 is .05 (500 is .02, and 800 is .01) on air infiltration. I dont know the exact Sunrise number off-hand, but it is in the same ball park if I'm not mistaken. It is close enough that I would not give it much weight in your decision.
Sunrise is .04 AI DH.
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Both will be quite fine for at least the next 20-30 years.
You can't go wrong with either window. I'd probably make the decision based on comfort level with the installing company and the details of their installation method.