If you must have something that can only run on 120V then you have no choice about the transformer. Other than that I would stick to the voltage that's compatible with the wall outlets. There is no performance change one way or the other with equipment that is sold with deferent primary voltages in the power supply --they all have one spec sheet.
Run with 240volt here in Thailand or use Step down transformer?
That’s the question. I’m currently retired in Thailand. What are the thoughts on running 240/50hz as opposed to 110/60hz? I have know idea. I’m ready to build a new system here.