I'd prefer peer adversaries; if it's Shermans and the Western Front Rhineland map then I suggest go reasonably authentic:
If it's Autumn/Winter 1944 then: Spitfire IX and XIV, Tiffie, Tempest, P-51, P-38 and P-47D (no 150 octane) vs Fw 190A-6/A-8/D-9, Bf 109G-6 late/G-14/K-4 and a limited number of Me 262.
If it's Winter/Spring 1945 then: Spitfire IX and XIV, Tiffie, Tempest , P-51, P-38 and P-47D (150 octane for the RAF birds only) vs Fw 190A-8/D-9, Bf 109G-14/K-4 and a limited number of Me 262.