Hobbs and Sutcliffe here too, though there is a strong argument for 'The Master' taking the opening birth in the pre WW1 side too. As many, and he himself, have said he was a better batsman pre war than post war. A more attacking batsman on worse pitches.
And yet, two of his greatest knocks came in the post war era - namely his 100 in the second innings on a sticky at the oval in 1926, and a 49 on sticky in Melbourne iirc in 1928- 1929. So maybe, post war is the place for the great man.
(And yes, as Sean, I think, has said, Trumper for all his fame as an opener, averaged better as a no. 5. Maybe a reason for A.C McLaren to open with Grace?)