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Do you want the "best" or my favorite? I voted for my fave, the A-20, knowing it was not the best.
1943 model Mosquito had a payload similiar to 1943 model Me-410A. 4 x 500 lb bombs and it's my understanding the bombs were modified to make them more compact.
Some late war Mosquitos were modified so they could carry a 4,000 lb "cookie" hanging partially out the bomb bay. I would hesitate to call that a normal bomber as it's good for only one thing - area bombing a city.
a superb gunship
Late War Period (1943 to 1945). Me-410A.
High speed.
Long range.
Well protected against ground fire.
Like other dive bombers the Me-410 has exceptionally accurate weapons delivery.
Low stall speed also improves bombing accuracy.
If you want to employ the B-25 for CAS and/or maritime attack then it will be attacking from low altitude and at relatively low speed.