Who has the best design?

Something I don't understand about Intelligent Design (ID). Presumably the same Designer perfected the designs of every plant and animal. So let's say a cougar kills a deer, even though the deer in question is young, healthy, and has a nice rack of sharp antlers. Can't we infer that the cougar had a better design than the deer? After all, if the deer had a perfect design, it would use its perfect senses to detect the cougar's approach, its perfect reflexes to go into a fighting stance, and its perfect weapons to defeat the cougar (and perhaps its perfect immune system to heal any scratches that occurred).

But this didn't happen. So does the Designer like cougars better than deer? Does the Designer just like the taste of venison, or like to watch the kill? Did the Designer accidentally or deliberately include flaws in the design of the deer? Or maybe, just maybe, the Designer created evolution and sat back to let it run its course on Earth?