For large aircraft, 1/700 for sure. Have an Fw-200 and He-177 from Pit Road that are spot on to OOB size. I even stuck a couple B-25’s in with the tac bombers.
Big fan of the axis and allies series especially the first edition of spring 1942. I would like to try the second edition (different balance, setup and map layout) but the price is high for lots of pieces I already have. I would be willing to pay for a board or exchange pieces from 1942 1st Ed.