I like the viper VTX 1 for it can run 2S, some of the 1S ESC can only run 1S. With the viper I can put it in my touring car or F1 if I need to. I actually keep one in my pit bag as a spare just for that reason, with the VTX 1 I am covered if I blow up a ESC at the track no matter what car it is.