low end motors vs high end motors

i have been trying to find the difference between the low end motors like the BK Wanderer/Feigao vs the high end motors like the neu and lehner motors.

i currently run a 9xl and its fast and runs great. and i only pad like 70$ for it. but i see a lot of people on this forum running the high end motors like neu that can cost up to 300$ for it.

sorry if this might be a stupid question or if its been covered before. if it has then can some one link me to the thread cause i cant find a thread about this.

thanks!