Please help on which lens Sigma 24-70 F2.8 hsm or Nikon 24-120 F4 VR

Group,

I need your help and advice on lens selection.

Going to be using as all around lens.

Currently I have the stock Nikon 24-85 VR variable Aperture.

What are the good, the bad, the ugly between the two lens.

I was thinking of the Nikon 24-70, but from all the reading, it is a great lens for studio and so on but not a all around walk around lens and the $$$.

Also, I do like the VR alot.