Flysky NB4 and never look back. I have all the Top end Transmitters. and I always grab the NB4 first. I have the NB4 in all my crawlers and Bashers. my Race gear has Futaba 7PX but recent upgraded to the 10PX. But seriously considering selling it and getting the Noble Pro for racing and having only the Flysky Protocol. For the price of the NB4 its unbeatable.