Well, it's a bit late, but I recently went through this process myself, and decided ...
The 224 is a fine camera that is fairly easy to use. It works at a different image scale than the 174MM.
The 174MM, when used correctly with RGB filters, is a tad better (compared on the same targets, same 'scope, same scale, same conditions), but it takes more effort in both acquisition and processing.
Assuming an optical train that delivers a suitable image scale, for the person who wants simplicity and good performance in a OSC camera, the 224 is a good choice.
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