I believe the 160 vc is Kodak, and the 160 s is Fuji. Correct? They should be comparable but they will not look the same in the print. I have shot the 160s, c, vc, and nc, and all gave radically different results under nearly identical conditions. Fuji film tends to have slightly higher color saturation (almost cartoony), colder tones, looser grain structure, and the curves tend to cross when shooting under indirect and mixed light.
I would warn against going with Fuji because of crossed curves. I don't know why it happens, but it makes color correction essentially impossible for an amateur (or anyone in there first year of serious color printing). The dark midtones (dark grays) turn magenta and lighter midtones turn cyan. you can imagine this makes for some pretty atrocious prints. It is unreasonable to expect consistently high quality prints from negatives that have crossed curves without using a prodigious amount of paper. As you can imagine no two frames are going to be identical in the degree to which this problem is manifest.
I have shot much more fuji then kodak, and have recently made the switch.
Then again, if you are not having trouble with crossed curves then ignore me!
one last thing. with color negative film ALWAYS double the recommended exposure. C-41 film loves over exposure! you get richer blacks, better midtone contrast, higher saturation, and tighter grain! start with 1/2 the manufactures recommended ISO.
Congrats on the color work! keep it up! RA4 prints can be exceedingly beautiful and its being abandoned for the convenience of digital.
Hope I was of some help!
Christopher Breitenstein