Total ords to be carryed: p47 D40 and N D is better on military power, N is on WEP
Best climb rate (and a much better turn rate) with 2*1000 pounders: P38. The rocket rack causes some drag though.
Best maneuverability, also the best low level performance with 2*1000ponders: F4u1D (not counting the 4hog, jack of all trades) It clearly outperforms the F6F.
The fastest with the named ordenance, but also the worst maneuverability: P51D
They are both pretty good, the question is, what is inportant for you, more ords, more speed, more turn rate, more climb rate?