this round no need to struggle choose SD888 or Exy2100, because both chip are make by Samsung Fab

last time SD show different compare to Exy because , SD make by TSMC Fab & Exy make by Samsung.
TSMC are world 1st chip maker even with same 7nm manufacturing tech, TSMC still best of the best!
this year for flagship chip, TSMC only manufacture Apple A14 & Huawei Kririn9000 order!

as such SD888 or Exy2100 will perform equally due to same Samsung Fab 5nm manufacturing process
Good luck to thermal handling for both SD888 & Exy2100