I avoid single blades, and prefer 2 or 3 blade knives. My favorite and most carried jack is an equal end I asked Todd Davison to build for me. The blades are nearly equal, but not quite. The wharncliffe is very slightly shorter than the clip.
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Stan Buzek is building me a slightly smaller jack (about 3.5”) similar to this, but with a straight edged secondary...
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I also have a Ruple sowbelly that carries and uses like a jack, but with an added awl for scraping and such. Since the awl sits flush with the liner when closed, it looks like a sowbelly jack.
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A trapper is also a jack, in my mind. It just has a specific traditional blade configuration...
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Almost forgot one of my newest jacks, a nice spear/pen in stag from Joel Chamblin...
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Thanks for the thread and all the great jack knives!