My favorite interceptor of the ETO would have been the Ta-152 i am sure, but seeing as how it saw little combat in its intended role, i wont make that my decision. Overall i would have to choose the Focke-wulf Fw-190D series. It could attain a speed of 425 MPH at an altitude of 21,710 ft. It had a somewhat limited range of 521 miles, but had good altitude performance and carried a decent armament. Two 20mm cannon and two machine guns, along with proviosions for 1,103lbs of bombs or attachable munitions. With good speed and armament, not to mention manouverability at alititude, in 1944 this aircraft was a treat to allied fightes and bombers.
My favorite fighterr/interceptor of the PTO would have to be the N1K2-j Shiden-kai. With a top speed of 362 MPH at 19,407 ft, it wasnt the fastest interceptor of the war, it was enough to deal with bombers and fighters of the allied war machine. It was also armed with four 20mm cannon, giving it a good punch, capable of downing american bombers and fighters with limited hits. The aircraft had a very good range of 1,577 miles, giving it good loiter time over a target, or even escort ability. However this aircraft had many troubles in its service life, but still had a good effect for the numbers employed.