Wayne Parham Messages: 18783 Registered: January 2001
Illuminati (33rd Degree)
There are a lot of good transformer brands. Choosing the "best" is subjective, like asking what is the best car.
As for voltage, that's not subjective but it's not qualitative either. There is no "best" level.
One caveat - Transmitting power long distances at high voltage and low current levels is better than lower voltage and higher current (for equivalent power) because the thermal losses are lower.