I can't speak to the ratings, since those are done by users.
If you read through the entire closings for both products, neither gets an unqualified approval. The ASUS' wireless performance appears better in my testing than the Apple. But there have been many changes in wireless testing procedures between the two, so direct comparison isn't possible.
Let me put it this way. I have yet to see a router that performs significantly better than any other in all wireless benchmarks. Some are better running download, others better running upload. Some have higher strong signal maximum throughput in 5 GHz, etc.
Put another way, more money tends to get you more features and more radios and higher maximum link rates on those radios, i.e. 450 Mbps vs. 300 Mbps. None of this necessarily translates into higher performance in all scenarios.
With wireless, performance is definitely a "your mileage may vary" proposition. Buyers should keep that in mind and be wary of any manufacturers' claims of superior wireless performance. You need to try the product in your environment with your devices. Only then will you know what is best.