Canncontrol by Mammoth When To Use

Picked this up and was wondering if it is something I can add to my watering as a preventative. Or should I just stick with neem oil.?

I would only use if there is some kind of issue annd the dyna gro cannot be used during flower not sure on the mammoth

The Mammoth says it can be used during flower and veg. The neem oil not sure about. I know I have had a lot of people swear by the neem oil as a preventative to straight avoiding any kind of bug attacks all together