This topic made the rounds several months ago on the Tentec reflector. Archives are online at:http://lists.contesting.com/_tentec/
Before wading through months and months of messages, though, I'd encourage you to email George, W5YR at firstname.lastname@example.org
George, if I remember correctly, owns a Kachina and contributed heavily to the discussion of strengths and weaknesses of thse two units.
Again, if I recall correctly, there were differences but not at a level where you would expect one to be twice the price of the other.
73, de Mike, K9UW