Have only read about these knives. Never handled either. From all I've read, the Trident is considered the most utilitarian of the bunch, the knife with the greatest application as a tool. On the other hand, the Tempest is purely a defense/combat knife. The identity of the designers is probably a good clue. Chief Watson has lived in the jungle and in combat situations. His knife is designed to be used in that environment. Michael Janich is a combat expert. His knife is designed for fighting.
Sorry, my sieve-like memory caught up with me. I have handled a Trident. Seemed like a very practical knife to me. Fit/finish were excellent.
Guess it boils down to your personal definition of tactical.