I like the Havok Pro or the Black GTB...just for color...lol...Ive ran my GTB and now my Havok in the same car and setup, and Im still turning the same lap times....
I dont think you will find any real difference and any of them to consider a better or worst...I think you will just pick what your pocket and preference will allow and be at the same level as the guy running a different esc than you...it will all be about the same.....
good luck and happy racing....VTA RACING that is...