I just brought some mouthpieces home to compare and contrast. I tried the Aizen LS 8 the JJ HR 8* and compared them to my personal Otto Link TE 9.
I was using a Rico Royal Reed size 3 for all three a long with my FL Brass ligature.
I chose the song smile and played it roughly the same way on all of the pieces to make it a fair comparison, I probably could have played something that pushed the boundaries more, but it was getting late and I don't like to keep my neighbours up.
My personal Thoughts were that all of these mouthpieces played well and were easy to play from Low Bb at a whisper all the way to about altissimo Bb (Forgive me for the bad altissimo playing in the highest register in particular on the Aizen: I probably could have used a harder reed)
I'd probably say that the JJ was the thickest sounding and the Aizen was probably the buzziest and my link is probably the hardest to control.
I probably enjoyed the Aizen most out of all of these, they just sort of play themselves (IMHO), But it's not so different from my Link - so I can't really justify one for the collection for now.
I'd love to get my hands on a TK Piece at some point to compare to these great pieces.
I don't know let me know what you think?