Given 2 cameras that are as similar as the D100 and S2, it's impossible to call one better than the other in all cases. Some people will need a certain feature of one or the other. Search this forum and many others (dpreview, etc) for opinions and rants.
The S2's sensor records 6Mpixels. It then interpolates to get 12Mpixels. Fuji claims that with a 45 degree rotated sensor grid, the x-y resolution is boosted. In practice this is only a minor benefit, and comes at the cost of moire problems with 45 degree angled lines. So the two cameras have essentially the same resolution sensor.
I agree, the choice is so close it's up to what features tip the balance for you.
For me, the S2's superior handling of ttl flash metering using non-DX Speedlights is standing out above other considerations. I'm not a big Speedlight user except for work photography and that's what I'd be getting a DSLR to do. Otherwise I'd probably go with the D100.
My film bodies are still in no danger when I'm doing my creative shooting...
I have been looking at the two and asked the same question here. After reading every review I realized that there is no consensus. I am simply going to get whichever one is available when I have the money.
I bought the S2 and really like it. I've been pushing it pretty hard these past 3 days. The software is painless. The body is a Nikon N80 so it feels good. The interface on the camera is pretty intuitive. Here are some pictures I've taken showing a range of subjects.
Chuck, are you sure that wasnt my Fuji S2 you were shooting with... Email me your mailing address so that I may send you my film for the Moab Trip... you will like the film I got. Fuji Velvia, Provia and some Kodak T400CN along with one roll of Kodak HIE (infared)... Should I add some CompactFlash Cards as well?