Who is the best Spartan according to Master Chief?
In Halo First Strike, John-117 believed he considered Linda-058 to be the best Spartan because she can operate effectively as a lone wolf and as a sharpshooter without needing a spotter. And given that she did an impressive stunt in First Strike (dangling off a suspended cable upside down and shooting Banshee pilots out of their cockpits), literally less than a day after surgically recovering from plasma wounds, I can see why.
John has also said that he would lose a fist fight to Fred-104 because not only does he consider him the currently physically strongest Spartan, but he also believes that Fred intentionally holds himself back to give the others the spotlight; in many ways, he seems to consider Fred to be his successor as leader of the Spartans. There's also the fact that Fred is a tactical leader, often the de facto leader of Blue Team when John's not around, and he is an excellent fighter with knives.
With all that taken into account, who is the best Spartan-2/Spartan in general? Both in practical terms and in terms of how the Chief judges them? One can even argue that Chief is the best since he's a jack of all trades, so to speak. He already spends most of the games being a lone Spartan with various weapons, so it's not an easy question to answer. But I want to know in his eyes, who is the best?