We used Trugreen for a few years and my wife became unhappy that they would occasionally kill a flower and that they did not seem to understand how to control weeds and insects.

So this year I do the lawn with commercial products.
I chose Scotts granulated fertilizer and used it twice with great results already.
But, some credit may belong to the extremely wet winter and spring, so the grass isn't thirsting.
And this excess water is adding more problems, particularly in the numbers of insects, particularly knats.
I'm looking for opinions of the best insecticide that is not part of a blend of other things, such as fertilizer other lawn products.