Aramaki best feats is what BM does when she's nerfed
She already trashed Queen without using her df and haki while GB needs his df and probably used haki too.
BM was nerfed mentally too.
She also trashed Judge (YC level dud ewho can fight Snack while injured and not lose)
No admiral has better feats than BM , maybe Akainu coz he beat Kuzan after 10 days