IMHO Api tests are good, I prefer their ammonia test to other brands, with the usual caveat about the nitrate one (that probably is the one used more often once the tank is up and running), you need to shake the $#!+ out of the reagent bottles to avoid the well known issue. For this reason, being in Europe, I use Sera nitrate test, for pH I use JBL as it has separate tests for low range and high range. Salifert, LaMotte and Hach have also a very good reputation but difficult to find this side of the pond.
P.S. having hybrids to grow out and not wilds I change 2/3 water every day so testing is a bit redundant