Always the top brands will be the most popular and over many years it is my opinion that this is because of their marketing strategy, history, reputation and worldwide acceptance more than any other reasons. This does not mean they are better or worse in any way, just means they are more accepted world wide and more people are experienced with their software. Thus there is some security for the owner in respect to programmer support or future resources etc (people come, people go) and a basis on which management may dictate what hardware is used. There is also the consideration on the capital outlay for programming software which can be very expensive.
Quality frequency inverters incorporate either an AC Reactor or DC Reactor (choke). Their inclusion in the basic design of the frequency inverter allows the design engineer to maximize the advantages of the choke. Their function is to reduce the current distortion caused by the input stage rectifiers by slowing the rate of change of current, and thus charging the internal capacitor at a slower rate over a longer time.

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In Discussion
Are there any zero installation, Windows based, stand-alone HMIs?
Should SCADA PC, HMI, PLC, DCS be on the same existing IT NETWORK
what is the difference of turbine impellers and propeller agitators?
Spur growth and demand for Electric Motors in India.
Bode diagram
question: I am in a debate concerning motion.
Problems overcoming check valve on fire pump system
ONE of my diesel generator 1400kva trips down
Should SCADA PC, HMI, PLC, DCS be on the same existing IT NETWORK
what is the difference of turbine impellers and propeller agitators?
Spur growth and demand for Electric Motors in India.
Bode diagram
question: I am in a debate concerning motion.
Problems overcoming check valve on fire pump system
ONE of my diesel generator 1400kva trips down