the degree of power, strength, speed, agility, etc. that you receive from the kyubi is FAR greater than what sharingan or byukagan can do for a ninja. it's pretty much unfair to compare what naruto has to let's say what itachi has. itachi's sharingan is really a huge plus in fights but kyubi whoops too much ass.

btw, i'm not saying that naruto is stronger than itachi, itachi would still kill naruto in a flash. just in case you needed to know.