Although I have great respect for the -262, I'd have to go with the Fw-190A-8/R2 Bomber Destroyer... If u went to the 8th AF Historical Society's Reunion, you could meet a group of guys who could tell you in no uncertain terms that they were scared to death of the Fw-190A8/R2's... They are the 40+ survivors of the Kassel Mission of Sept 27th, 1944, when the 445th Bomb Group was almost wiped out of existance... They lost 33 of 37 planes that day, mostly to two waves of Fw-190's attacking from the rear... 25 bombers went down in about 3 minutes, the wreckage scattered over about 15 miles of the German countryside...
Martin Caindin said in his book "Black Thursday" (the Schweinfurt raid in October, 43) said that gunners could see their .50 cal rounds, including armor-piercing, bounce off the armor plating on the Fw-190's...
The Fw-190A8/R2 was equipped with 2 13mm heavy machineguns in the nose, 2 20mm cannon located near the wing roots and 2 30mm Mk 108 cannons mounted outboard of the propellor arc... The 30mm cannon replaced 2 20mm cannons located on the outer wing section...
The Fw-190A8/R1 carried no less than the 2 13mm machineguns, 2 20mm cannons internal to the wing and 2 R1 'Rustak' pods, each containing 2 20mm cannons!!!! Imagine the poor tailgunner looking through his gunsight at an Fw-190 coming in with 6, yes I said 6, 20mm cannons blasting away at him, well beyond the range of his .50 cal machineguns...
The -262 to me was just too fast, and did not enough time on station, to effectively claim the title as Best Bomber Killer...