Higher voltage lower current is always better within limits. Step down transformers are a challenge in themselves.
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if your using digital and-or a turntable you may want to see if its compatible with the 50hz supply, most amps and preamp are fine with either.
other than that, do not plug a 115-volt component into a 220v supply without a step-down transformer unless it has switchable voltage settings. plug types usually make this imposable but there are cheater plugs out there.
I have moved to Europe, from the USA, twice. Simply bought myself a 2 kW voltage converter/power stabilizer. Worked perfectly for me. Alternatively, just buy a 240V-120V transformer and use it with your power conditioner. See my previous post on this subject.
If your equipment has a switchable input and you can set it to 240V, that will work just fine. I have owned various pieces of QUAD and Revox equipment with 100, 120, 220 or 240V switchable inputs that worked just fine in the UK (240V), Europe (220V) and USA 120V.
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.