Render to MP3 FH vbr hq?

I could not find in the manual under Index what this MP3 represents. My understanding was the MP3 at 320 was pretty much the best MP3 you could get. The MP3 encoding at Variable bit rate at the highest quality has the FH vbr HQ. How does this compare to the constant bit rate at 320?

Ok, according to this web site VBR is better than CBR for 2020 with a smaller file and best audio quality?
https://www.lifewire.com/difference-between-cbr-and-vbr-encoding-2438423