They're both decent cameras, but ...
I have had the S7000 since November and have been quite pleased with its images. I can hardly believe that its picture quality would be poorer than the Kodak 6490, though that camera has some nice features, including the 10X optical zoom.
Frankly, I think either of these cameras is more than adequate for your stated requirements. There are lots of 3 Meg cameras that would be fine.
I believe the S7000 has more advanced features than the Kodak. Kodak seems to aim mainly at making decent cameras which are very easy to use for amateur photo enthusiasts. I think you will need to read the instruction manual carefully to get the most out of the S7000.
Anyway, good luck!