To be honest, you can not go wrong with either. Orion is easier to program. I find the brakes to be really strong on my Flow's. I run LRP motors though. Lack of brakes could be timing issues between Timing sensor and ESC. Both are smooth.
I have been told for 17.5 Blinky, that the Flow comp is punchier, less FETS internally. I run the Flow Comp for 17.5 Blinky and a Flow Works with Mod motors.
Xray T4-14,T4-15, X1
Pro Mini Truggy Mid Motor Mafia Xfactory
Serpent SRX4, 811 TE-e
Kyosho RB6, MP9e TKi