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I recently downloaded Zencart to evaluate it. When I went to their homepage, I could have sworn that I was looking at a XOOPS site. By default, Zencart blends right in with the XOOPS layout. Zencart is much easier to use than OSC as well. OSCs front and back ends are cluttered and not at all intuitive.
Ok, so OSC has more modules. I can see that as a valid argument. However, for the average eCommerce site, Zencart all the functionality you could need.
psst: There is always the option of contacting the author of the OSC module you need and see if they are interested in porting their module over to Zencart. A lot of developers are happy to do such things, especially if you put a $$$mile on their face.
Keep up the great work Mithrandir and Preditor! I'm eager to see what you turn out.