I checked periodic table of elements, it didn’t really distinguish the difference between nitrogen from bat guano or nitrogen from any of the synthetic sources haha.
Find whatever has good enough reputation for providing what you need that you can get the cheapest. Megacrop seems to be making pretty good push. People have been using jacks hydro 321 for quite some time. Hydro gardens seems to have a pretty good blend too. You may also have local greenhouse supply that has their own blends, or at least sells others.