Tough call, I have the kraken and its much more accurate than the JG (panther), (yes from experience)...but I have not had experience with the broxa.
If you are playing outside, I'd say the panther, inside, broxa.
I love my kraken, not going to lie its never let me down. I do have teh CQB knight from aftermath as well. Its sketchy, the hop up is shot I think...for cqb its a good choice cuz I got it on sale.