My favorite PTO have always been and still are Salomons and New Guinea.
There's a plenty of time for a long career on one map, plane's like F4F, SBD, A6M, D3A, F4U, F6F, B5, TBF are used as "carrier based and land based" so set is very versatil. On Salomon's we have naval battles.
There's a chance for P-40, P-38 D/E/H, P-39, Ki43, Ki61, B-25, A20, Beaufighter and other's interesting aicraft's.