Gary, both products have evolved a lot over the years, so unless you've done very recent comparisons it's hard to come to any firm landing on which produces a better scan. I am using the latest versions of both applications and I just selected a Kodachrome slide with a lot of dark nasty material in it, used the same resolution, working space and profile in each software with my Nikon SC-5000-ED, opened the scans in Photoshop, enlarged them to 200% and pumped up the exposure to reveal the worst of it and I have to say - the image structure and noise looked very similar at any position along the tone scale. I much prefer the SilverFast GUI and the refinement of a number of its tools, but the image structure and noise characteristic (without performing any edits at the scan stage) look pretty much the same. I think these factors depend more on the film and the scanner than on the software driving the scanner.