Haha, I know I'm personally sick of dog food threads

Here's a very informative site that will help you learn about dog food.. http://www.dogfoodproject.com/

and maybe check out this thread
http://petoftheday.com/talk/showthre...ighlight=grade

And to answer your question...I'm pretty sure Eukanuba and Iams are from the same company (correct me if I'm wrong ) but coming from the link above, Iams is a tad bit better than Science Diet...but it's still not too good

Iams Lamb Meal & Rice Formula Premium / Score 73 D
Science Diet Advanced Protein Senior 7+ / Score 63 F
Science Diet for Large Breed Puppies / Score 69 F