That is an unusual comparison, since the S70 costs about twice as much as the Z915. And yet the Z915 has twice as much optical zoom.

I have not seen a review of the S70 yet.
The 3.5 inch touch screen probably adds about $60 to the cost of the camera.

The Z915 got a good review and the sample photos I have seen, look very good.

Here is a comparison of specifications:

http://www.dpreview.com/reviews/compare_post.asp?method=sidebyside&cameras=kodak_z915%2Cnikon_cps70&show=all

There are two errors in the chart.
Regarding:
Shutter Priority
Aperture Priority
They should be marked yes for the Kodak Z915.

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