I’ll offer my quick input on Tenacity. I’ve used it to great success, WHEN it was appropriate.
It works great for weeds that are already sprouted mid season, it just takes some time. It works great when you are re-seeding a lawn, early or mideseason, as it doesn’t take out seeds (grass, or weeds). Obviously we all know establishing a lawn mid-season is a no-no, but sometimes there’s no other option. It stops photosynthesis on wide leaf types, so there needs to be an already established rhizome before it will do anything. It is less “harmful” to people the moment it is spread than other standard herbicides (supposedly). (I wear long pants and an N95 when spreading “normal” varieties. I’ve used it a month after mixing, and it still worked as advertised.