I've never heard of Par3 before but it is the same active ingredients (2,4 D, Dicamba and Mecropop) as Killex.
After some extensive research on the topic I'm a big fan of spraying weeds if done responsibly. The reason so much of "the good stuff" is banned is from poor application practices. Weed and feed was great in theory but people over used it because of the fertilizer component. You can still fertilize and spray weeds independently and achieve the same results. All of the selective herbicides can and will leach into the water system when over dosed. In my opinion on an average lawn all that is ever needed is spot treatment. I use Killex to control Bellflower. For simpler weeds like Dandelions I've found the eco products work fine.
As for the cost of Killex you can buy the concentrated format and mix it yourself. It's far cheaper that way and my 1L Killex has lasted me a few years of spot treatment.
Fun fact: 2,4 D was one of the two active ingredients in Agent Orange.
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