You are better ask up on
http://www.dpreview.com/My bet would be on the Nikkor 70-300, assuming that you are talking about the non-ED version. (ED version is $300, non is about $150).
If you are getting this as a kit lense, ie: your only lense...I'd scrap both and go for a wider angle lense...like the 18-70 lense that normally comes with the D70. It's a fantastic lense for $300.
-- Dave