Which Nomu is more powerful, USJ Nomu or Hood?
There are three categories of Nomu up until now in BnHA:

Low-End Nomu like the ones at Kamino. Low-End Nomu serve as foot soldiers and can overpower minor Pro Heroes. These Nomu are light in color and possess a multitude of Quirks as well as enhanced physical strength. 

Mid-End Nomu like the ones at USJ. Mid-End Nomu can contend with the top Pro Heroes. These Nomu are generally black in color and possess the Super Regeneration Quirk and are even stronger than low-end Nomu.

High-End Nomu like Hood. High-End Nomu are intelligent Nomu that completely outclass the other Nomu. They possess abilities that can even overpower the top Pro Heroes, including up to six different Quirks.

So Hood is the strongest Nomu so far...


   And in the latest chapters it is shown that there are other High-End
 Nomu being made.