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While I appreciate the attempted comparison, I don't think it can be used as a true comparison.
As others have said, it really needs to be done on the same night, same illumination, same conditions.
The webcam image is overexposed in some areas, and looks like it was taken in worse seeing and/or not processed to the best it could be. It looks a bit too smooth.
For a larger format image, the 350D will be great it would be possible to take a few using burst mode to stack, but the results will be limited and will still end up quite noisy if you take a crop.
The resolution of the webcam is limited at 640x480, but at longer focal length it will always out-do a DSLR (in my opinion) due to its ability to take many frames (over 1800+) and capture the seeing. That is, taking so many frames will allow you to find the sharp ones as the seeing fluctuates, and stacking the best few hundred will reduce noise and enhance detail (through processing).
You would have to be quite lucky to get a very sharp image across the whole field with a DSLR, as you need to capture that image when the seeing is good.
DSLR's are great for "whole moon" type shots where you want the large format and wide field of view. Assembling mosaics from small webcam images is very time consuming.
I look forward to more comparisons as it's a very worthwhile exercise! Well done!
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