Bowtech Black Knight and Mathews Black Max will be close to eachother in speed, with a little advantage towards the Bowtech.
Another question is if you can actually shoot it at those speeds. I know a man with a 70# Black Max at 30" draw, but he is shooting heavy alu's going trough the air like trown sticks. So his speed will be not so high after all. I have been shooting a Mathews Z-Max at the World Championships, believing that speed was everything. Not! Lately i found out my top speed will be somewhere around 295 -300 and i prefer the higher braceheights with this speed. As soon as we do tournaments shooting the fasterst instead of spots, i go back to the speedbows.