This is not a "which is better"-comparison between my two sets...they are both phanomenal and really great drum kits.
I tuned them slightly different to get the characters of both kits best displayed.
The Ludwig is tuned a little bit deeper and more thunderous, the gretsch a little more open and singing.
Same Mics, same room, same light processing through logic.
Drumsizes are 24x14, 13x9, 16x16
Heads are Remo Emperor on both Bass Drums (Reso Ludwig is Clear Ambassador, and Coated Ambassador on Gretsch),Gretsch Toms Emperor Coated, Ludwig Toms are Coated Remo Vintage Emperors, Snare Drum is a Ludwig Black Beauty 14"x6,5" Emperor DotX.
Overheads are AKG C214 Bassdrum is a AKG D12VR and a C214, Snare Top & bottom Shure SM 57 and Toms are Sennheiser e604 Clips Mics and Room is a budget ribbon lollipop mic.
