Of course, but we are talking about one particular case and we're making a comparisson between two particular coaches.
Let me get this straight, i have no idea who is the better coach. I'm simply asking how did people conclude, and they are pretty sure in what they say, that Prandelli is better than Ranieri.
Compare the acomplishments and you get that even at Prandelli's age Ranieri won more titles. It's not like we're talking about a 70yo and a 40 yo coach. There is a less than 6 years difference between the two of them.
Since both of them achieved more or less nothing then i assumed that those who say that Prandelli is much better must be thinking that he must be doing some things much better than Ranieri (like setting tactics, making subs, men management, changing the formation depending on the result etc etc etc)