Ok. First off, I never post on forums or at least I haven't for years. I don't have a sig, don't have any info in my profile, no avatar, etc. I pretty much only read manga on this site. However, I do Read the forums occasionally. Mostly because at times I have found the debate threads on here entertaining, or at least the arguments and the logic behind statements made, if any at all, entertaining. So I saw this thread and thought, "Why not? I'm going to add my 2cents for once."
First of all, my stance on the topic is that I DO NOT think Naruto's eyes are better than the Sharingan in any area. That being, said let me tell you my opinion which I'm sure many have stated previously multiple times on the matter. I think what Kishi is showing us is the awesome power of the Nine Tails and it's chakra. When in BM or KM Naruto's whole body is infused with the beast's massive and potent chakra. This infusion of chakra is what enables him to see while moving at super speeds and it allows his brain to percieve, recieve, and send messages to his body at super speeds. Think of it, his eyes are infused with chakra just like his muscles, brain, organs, and most likely all bodily systems (nervous system, immune system, etc.). Just like when he uses SM (infused with Nature Chakra). But his eyes ARE normal eyes. The sharingan could be infused with chakra the same way naruto's can. It's not the eyes that are powerful but the 9tails +naruto's chakra infused with his body (which by the way the 2nd son recieved the sage's body) Meaning Naruto probably has a better body as a vessel for containing such massive chakra. Which is why he is suited as a Jinchuuriki. Anyways that's my 2cents my first thread response. Don't get all crazy and flame as I said this is just opinion. +rep to the original poster though for debating with logic as they always should be but seldom are. especially on these forums. Which is why I love them hehehe.