...the “Organic” kind may be devoid of the miracle drug due to the lack of full spectrum nutrients supplied by science-developed chemical fertilizers.
I'm ambivalent about GMOs. People have genetically modified plants and animals by breeding for time immemorial. What do you think Jacob was doing to his flock in Gen 30:37-41? Directly operating on the genes chemically is a variation on the theme. Modifications can have positive and negative effects. Knowing the trade-offs, which modifications are more beneficial than troublesome, leads to the fundamental, individual decision.
Either broccoli and other crucifers have ITCs naturally or they don't. Certain growing practices may or may not increase or decrease their effectiveness. It will not be a GMO vs Organic issue unless someone can show research positively proving that one method is adding or subtracting the vegetable's natural effectiveness. Otherwise, buy the type you want for the reasons you prefer and eat your broccoli.