for 1/10~1/20 demagnification, which is sharper, micro nikkor 55/2.8 or 60/2.8

[gratings]

Could anyone tell me for 1/10~1/20 demagnification photography, which is sharper, micro nikkor 55mm, f/2.8 or 60mm f/2.8? What's the main difference between them? Thanks a lot!