262 hands down. The 162 would have become a better fighter with a few months more development and proper production. A properly built He 162 could best a 262.
The Volksjäger program was a pipe dream and Heinkel knew this from the start and designed the He 162 as a proper fighter demanding a proper pilot to fly it. The He 162 was a truly excellent design, and a truly remarkable feat since it went from design to production in just three months. All of the 162's vices, including the too powerful rudders, were known in January 1945, but production couldn't be halted for any reason; the enemy was literally at the gates. However, in the closing weeks of the war a number of He 162s were built in the Mittelwerk underground factory at Khonstein. These were properly made, and it was these examples that were tested by RAE Farnborough and Eric Brown. It was Brown's favorite early jet.
As for people claiming Eric Brown is biased, I dismiss any such claims as nothing more than whining from lesser men. I've had the honor of meeting Eric Brown and he is a perfect gentleman, and apart from a (justified) pride in British accomplishments I have not heard or read one word from him that I find in any way biased. On the contrary; I find all his conclusions to be supported by well researched arguments. You may disagree with his arguments, but that does not make it bias. His detractors would be wise to look into their own bias.
In Eric Brown's "Duels in the Sky" he presents his "picks" for the best single engined fighters of WWII:
1 Spitfire and Fw 190 tied for first place
2 Hellcat
3 Mustang IV
4 Zero
5 Tempest V
6 Kawanishi George
His best picks for carrier fighters:
1 Hellcat
2 Zero
3 Wildcat
4 Corsair
5 Sea Hurricane.
6 Seafire
His "picks" are not based solely on performance, but also on the impact they had on the war. You may disagree with some of his choices, but this is clearly not a man with a bias.
Eric Brown is the most experienced test pilot and naval aviator that has ever lived, and many of his records will probably never be broken due to the circumstances of WWII. Pilots of the future simply won't get the chance. No man, living or dead, possess the same magnitude of firsthand knowledge of Axis and Allied late-war aircraft. Brown, speaking German, was on the British "Enemy Flight" team that scoured the German countryside for aviation technology. He personally interrogated people like Kurt Tank, Willy Messerschmitt, Ernst Heinkel, Hanna Reitsch, Hermann Göring (!), Erich Hartmann, Werhner Von Braun and many more. People would be wise to listen to this man.