I have used Knorr for so long it's my go to, but I wouldn't say its the best thing out there, just that it's easy to get a consistent in taste. At times I wish that there was a low sodium version.
It's not powdered, butt Savory Choice broth concentrate works pretty well for me. One packet makes a cup of broth, and it comes in a reduced sodium version.
I eat a lot or ramen, but never use the packets. I save them for use later. One packet to 1 1/2qts water makes a okay broth, be it a little weak. Any less water its too salty