Need help choosing a camera lens

I've got a D810 and wanna go for one of these two options as they are locally available. I'm planning on shooting lego photography. My lego photography will also include background in a lot of pictures I just need that macro so I can get clarity when being close to my image.

  1. Tamron SP 90mm f2.8 Di Macro 1:1 VC USD Lens - £550
  2. Sigma 105mm f/2.8 EX DG OS HSM Macro Lens - £395

The sigma is quite cheaper so wondering if there are benefits to spending more for the tamron?