Question for the community: What is your criterion for a good pointing device to go with your keyboard?

I favor trackballs, myself; I find then less effort to use than a mouse, and I've used nothing but the Logitech TrackMan aince the optical version became available.  I will cheerfully use a nipple mouse (what IBM calls a TrackPoint) if a trackball isn't available.

I'm not so much asking if my preference is shared, though; I'm more curious whether there is any discernable and unusual pattern of preferences that goes with liking tactile keyboards.
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