I use CBZ since it is simple and portable, and it'll be easy to do something else with it if I ever decide to. I tend to buy from Amazon, so my conversion process is based on that.
I just bring the kindle file into Calibre with some help from Alf, and convert it to an epub. Then I convert the epub into a CBZ. It's pretty simple to do manually but I just wrote a quick and dirty batch file that I can just drag the epub onto in Explorer, and it handles the conversion.
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