That is according to former Swansea manager Paul Clement.
Both new arrivals shone as the Gunners swept aside Everton at the Emirates last night.
Aubameyang netted his first goal, while Mkhitaryan grabbed three assists on his first start.
But Clement claims neither new addition is the best piece of January business completed by Arsene Wenger.
“It’s only one game but Mkhitaryan looked good, Aubemayang,” he said on Sky Sports.
“For me the best signing for Arsenal is Ozil, Ozil re-signing.