Nikon 60mm 2.8 or Tamron 90mm 2.8 VC Macro lens?

I want a macro lens, for my DX D7100. Cropped sensor, Sharpness is priority. Price doesn't matter, since its a thin difference.

So yeah, Nikkor 60mm 2.8 micro, or Tamron 90MM 2.8 VC macro?

Nikon makes some of the sharpest and robust macro lenses available.

I have one from 1971 that had more resolution than film could record, even Kodachrome.

I still use it today after converting it to an AI lens so it would mount on my Nikon F4 and Nikon dSLR's

Tamron has been around for a long time, but I do not know of anyone who has had one in use for a few decades that would infer how rugged it is

The two lenses score very close when it comes to sharpness, a score of 20 vs 21 according to DXOmark website.

The 90 mm will require you to be further away from your subject and will produce a shallower depth of field at any given lens aperture. For some applications, it is important to have enough depth of field to include the whole subject being shot.

I suggest that you visit a proper camera shop and test both lenses on your camera to see which feels the best to you and provides the best working distance at 1:1 macro settings

The 60mm Nikkor.

I have a 90mm Tamron which i have kept over several upgrades of camera body. It works really well but on a crop factor camera you really need a tripod.

Here's a handheld shot on the Tamron from last summer:
http://upload.pbase.com/image/150661279

I'd go for the Nikkor.

Simply because it's the original.