None of the above...
Of the aquarium grade test kits I like Elos. I find them similar to Sailfret, but a little easier to use.
Now if money is no object, then the test kits by LaMotte or Hatch are far better than any of the aquarium grade test kits, but be prepared to pay for them. You can figure about $50 - 75 Per test kit for those, but some are less expensive.