Board Thread:Questions and Answers/@comment-10797017-20130624101208/@comment-11051098-20130708221434

Akon is alot older, yes, but Nemu is created by Mayuri. We have no idea how strong she really is, as we haven't seen her in combat or anything.

Besides, when they prepared to open the Garganta from Hueco Mundo to the Fake Karakura Town with the stuff Mayuri found in Szayelapporo's lab, Nemu could be seen lifting and carrying one of those large columns with no effort at all. She's apparently created with the ability to do really hard work.

I'd say she appears to be much stronger than Akon.