I'm going to cheat a bit here with the P-40,
1939 to 1941
P-40 no letter*
With only two aircraft, adaptability is important because each aircraft must address different threats and missions. Both the Spitfire and Bf 109 with small fuel tanks were basically point defense fighters with very limited power projection footprint and poor load carrying ability. The P-40, with over 50% more internal fuel capacity than the Spitfire and 40% more internal fuel capacity of the Bf 109 has a much better power projection footprint and has a better load flexibility. In addition, the airspeed of the P-40 at 15k using 1050 hp was 352 mph, the Spitfire Mark II (Merlin XII) with 1140 hp would do 345 mph, and the Bf-109E (DB 601A) with 1020 hp, would do 348 mph. Climb was similar. In airspeed and climb It is apparent that the P-40 is quite capable of holding its own with its European counterparts at the lower altitudes and that would translate to higher altitudes if it just had the engines. The P-40 had a much better roll rate than the Spitfire and Bf 109. U.S. pilots stated that the P-40 was responsive, predictable, and could turn inside all other US fighters, which is apparently true except for late model P-38s.
My selection for this period, although it is a few months out of the range, is the P-40 with a caveat, install the latest Merlin engines*. The P-40 has performance equivalent to contemporary fighters on a per horsepower basis. P-40 has a significantly larger combat footprint and has a more flexible and capable air-to-ground performance. With a similar stall speed as the F4F, it should not be difficult to make carrier compatible.
B-17
I don't think there is a better bomber out there for this period. Could be modified to carry torpedoes but wouldn't want to. Quite flexible but poor cargo carrying ability.
1941 to '43
F4U-1
This decision was much more difficult. Because long range escort was needed even at this early stage, European fighters were basically eliminated. This left only the F4U-1 and the P-38. Both were excellent aircraft and were being built at the end of the war. Both had the range to provide a large combat footprint and long range escorts. Both had good ground attack capability, the F4U had a more rugged engine but the P-38 had two. P-38 could control the high ground but I don't think it could ever be made into a carrier capable aircraft.
B-24
Better range than the B-17. Not as good service ceiling, though. Can be easily converted into a cargo plane (C-87, though problematic was useful).
43-45
P-51
Huge combat footprint. Formidable fighter to the end.
B-24