Tolkien's dwarves were craftsmen (should that be craftsdwarves?)
A good craftsman has a different tool for each task so general purpose knives would not be favoured by dwarves. Gimli said, "Dwarves make light of burdens", so the extra weight of a whole set of different knives would not be a problem.
As craftsmen, dwarves would prefer well-made, simple, functional tools but they were also obsessed with gathering wealth. I imagine that every dwarf would carry at least one fancy, (though still functional as a close-quarter weapon), bejewelled dagger, the most expensive he could afford, to show off his wealth and status.
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