Many grasses such as Wheat prefer NO3.
Genmeralizing is rather tough to do, then the issue of how to get enough N to the plant without burning the plants and killing the fish, the shrimp and the fry.

Toxicology studies will show most of the test organism are not that interested in high levels of NH4+, whereas NO3 can be 100X higher without issue.

And a stead stable supply of NO3 allows the plant to grow much better at a higher growth rate than does pulses here and there of very low level NH4.

How does one maintain a steady NH4 level that's safe and easy to measure to see if the plants have enough? I do not know of a decent way and it does not matter in terms of the growth of most plants.

Regards,
Tom Barr