I've tried them all, and I have settled on Comic Rack. It's by far the best, with the right amount of speed and features. I'm hesitant on buying the full version because of License Validation concerns as reported in the comments and reviews. But it's free version is pretty much a complete product. (anyone have real issues with full version?)
Komik is a good 2nd place, but its interface screams made for phones and small screens. Comicrack scales well.
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