The difference between a cheap an expensive motor will be a few things.

Like if its vs a Reedy M3 or the brand new M4 VS cheap brands should be efficiency, powerband, and power output for a given wind. Efficiency meaning less power given to the motor is turned to heat. Which most of the time isn't a problem in mod, unless you run mod 4 wheelers.

I've had a few brands of mod motors. Muchmore, Orion and Reedy m3. The Orions were the oldest. They were fast and provided great power, but weren't as smooth as the muchmore and reedy motors I replaced them with.

I'm sure your turnigy motor is fine, but you might like nicer motors better. I switched from the Orion 7.5 to Muchmore 7.5 to a Reedy 7.0. The Reedy is the best motor I've used. Smooth, consistent vs the input you give it and nice to drive. The Muchmore was great as well. I've driven my friends car thats on the AE team and the new M4 motors are even nicer.