When it comes to frequent use, the smaller or more common household knives are usually the winners.
I have a serrated kitchen knife that gets more use than all my HI blades put together: cutting onions, bread, meat, etc.
I used to use a small, two-blade Swiss army folder for most small jobs, such as scraping small amounts of paint or putty from a window, applying epoxy to a crack, etc. That knife has been replaced by an oversized karda that came with a vintage WWII khukuri.
Lately I have become partial to knives with full-sized handles and short, thick blades, such as the mini-AK bowie (not so much the micro version, as the handle on that one is a bit small for my taste). You can do almost everything with these knives (except serious chopping), including self-defense.
For anyone who thinks that you need a long blade for self-defense, consider the Karambit.
First one is by Dil Kami, second one is a folder by Fox Knives:
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I should add that the HI version by Dil is much more robust. However, I also like the looks of the Fox version.